A curl is the spec that generates the most reorder arguments. Not thickness, not length — curl. A buyer orders “C” from one factory, reorders “C” from another, and half the cartons come back because the curve sits differently on the eye. Nobody lied. The letter does not mean the same thing in two factories.
Here is what the six common curl names actually describe, where each one sells, and how to write a curl spec that survives a change of supplier.
The short answer
C is the volume curl, D is the drama curl, J and B are the natural curl, and U and L are specialist shapes you stock in small depth for specific customers. Open your first shipment heavy on C, medium on D, light on everything else, then let sell-through redraw the mix.
The shape of the market, not a formula.
Why the letters are not a standard
A lash curl is a two-dimensional curve, and it varies along three axes:
- How high the tip lifts above the base line.
- How far the tip travels back toward the eyelid as it rises.
- Where the curve starts along the length — near the base, or only in the last third.
One letter cannot carry three variables. Factories settle on their own mapping, and the mapping drifts: a “C” from one line can sit closer to another line’s “CC” than to its own “D”. Catalogues list seven to twelve names — CC, D+, L+, M and others fill the gaps — and each is also locally defined.
Factories often quote a lift angle in degrees, roughly 40–45° at the J end and 70–80° at the D end. Treat those as the factory’s shorthand for its own curve, not a measurement you can hold another supplier to.
So: the letter is a search term, and the physical sample is the specification. Buy on the sample, keep it, and reference it on every purchase order afterwards.
The six curls, one by one
| Curl | Shape | Lift | Where it sells | What to watch |
|---|---|---|---|---|
| J | Gentle arc; tip barely above the base line | Minimal | Natural, “no-makeup” looks; hooded or deep-set eyes | Disappears on a strongly curved natural lash |
| B | One step stronger than J, still soft | Low | Natural retail lines, older customers, office wear | Barely distinguishable from J — do not stock both deep |
| C | Even lift through the mid-length | Medium | The highest-volume curl in most catalogues | The name most likely to differ between suppliers |
| D | Strong lift; tip curls back toward the lid | High | Dramatic sets, event and bridal wear | Too much for a flat lash line; heavy on small eyes |
| U | Near-semicircular, wide open; tips point almost straight up | Very high, wide | Spiky, “wet look” and manga-style sets | Curl eats effective length — a 12 mm U reads shorter than a 12 mm C |
| L | Flat base, then a sharp bend near the tip | Length-led, minimal arc | Hooded and monolid eyes | Not a curl substitute — a C customer will reject it |
J and B: the natural end of the range
J is nearly a straight lash with a suggestion of curve. Many retail customers do not want to look like they are wearing lashes, and a C reads as “done” to them. J also solves a fit problem: on a hooded or deep-set eye, a strong curl disappears under the brow and the lash looks short.
B is J with slightly more life. It is the curl most often ordered to hedge and least often reordered on its own, because the difference is invisible at arm’s length. In a range, J and B are usually one slot, not two.
C: the volume curl
C suits the widest range of eye shapes, photographs well, and is what a customer reaches for when she is not sure. If you can only commit to one curl in depth, this is it.
The catch is the problem above: because C is the default, every factory has its own version, and the one you approved three reorders ago may not be the one on the line this month. Re-check C on every shipment, even when nothing else changed.
D: the dramatic end
D lifts hard and curls the tip back toward the lid. It is deliberately visible and it sells to a customer who wants that. In Gulf and West African retail it carries a large share of evening lines; in salon supply it is a standard row on the display because technicians need it.
Two notes. D on a flat lash line can look like it is lifting off the eye rather than following it. And D in long lengths (14 mm and up) is where complaints cluster, because the tip has further to travel and any inconsistency in the curve shows.
U and L: the two specialist shapes
U is nearly a semicircle. It gives a spiky, wide-open effect and is behind most “wet look” and manga-style sets. It is not a volume product: it is a look a defined segment asks for by name. Stock one or two lengths, shallow.
L is the shape buyers underrate. The base runs almost flat along the lid, then bends sharply — close to a right angle — in the last part of the length. The result is length without arc, which is what a hooded or monolid eye needs: the lash extends forward instead of curling into the brow bone. L is the answer for a customer who has stopped buying C because “it disappears”.
How to split an opening order
This depends more on who your customers are than on which country you ship to:
| Your customer type | Curl mix to open with | Why |
|---|---|---|
| Retail, walk-in trade | C in depth, D second, J or B third, U and L token | Widest range of faces; specialist shapes need a customer who knows to ask |
| Salon and technician supply | All six, shallower per curl, C and D deepest | Clients’ eye shapes differ; they will not switch supplier for one missing curl |
| Private label for one brand | Whatever that brand’s photography uses | Your customer’s catalogue defines the range |
| Sets and gift packs | All components in one curl | Mixed-curl sets create complaints you cannot explain to a retailer |
Percentages in your plan should come from sell-through after two reorders. The table is a starting position, so your first order is not 100% D because D photographs best.
One commercial detail: each curl is a separate SKU. Stock minimum is 20 boxes per style; simple private label starts at 200 boxes, printed private label at 500, full OEM at 1,000 boxes per style. Curl does not change those thresholds, but six curls is six SKUs and the minimum applies to each. That is why new buyers over-order D and under-order C: they budget for one style and find they have bought six.
What to write on the purchase order
A curl name alone is a weak instruction. A purchase order that survives a supplier change carries six lines:
- Curl name plus a physical reference. Keep a signed, dated sample card, photographed next to a ruler. That photo is worth more than the word “C”.
- Base type. Flat base, round base or clear band — they read very differently once applied, and buyers forget they specified one.
- Fibre thickness in the factory’s unit. A second trap sits here: “D” appears in two columns on most spec sheets. In the curl column it means the drama curl; in the thickness column, codes like 20D or 30D, or the word “Dense”, describe fibre weight, not curve. Confirm which column is meant before you approve.
- Length range per row. Curl and length interact; a strong curl at 14 mm behaves differently at 8 mm.
- Pairs per box. Our SD series is 10 pairs per box, the WD series 5. Pair count drives unit economics more than curl does.
- Consistency requirement. State that the curl must be consistent within the box and across the order, and say what happens if it is not — that sentence is what makes a claim possible later.
Three checks before you commit 500 boxes
Compare against your own stock, not a photo. Lay the new sample beside a lash you already sell, base to base on a flat surface. The eye reads a few degrees of difference here and none at all in a product shot.
Flex the fibre and let it go. Bend the tip gently from the base. A curl set in the fibre returns; one pressed rather than formed tends to stay where you put it. It is a screening test, not a laboratory one, but it catches samples hand-shaped for the photo.
Ask which line your sample came off. Sample rooms and bulk lines are not always the same curl. If a supplier cannot tell you, treat the curl as unconfirmed.
What we will and will not tell you
We will send a physical curl card, tell you which curl each style is built on, and quote curl by curl so the SKU count is visible. We will say when a curl you asked for is not one we run, rather than substituting the nearest thing.
We will not tell you which curl sells in your city. That is your sell-through data, and any supplier who claims to know it is guessing.
Related reading
- Eyelash MOQ explained: what 20, 200, 500 and 1,000 boxes actually mean
- What actually drives the price of private label eyelashes
- What actually happens inside a lash factory: seven steps from fibre to box
- 12 questions to ask before you choose a lash supplier
Curl descriptions here reflect how our own lines are built and how the terms are used in the trade. Naming is not standardised across factories, so a sample from any supplier — including us — should be approved physically before bulk production. Nothing here is a claim about test results, certification or sales performance.
Want a curl card before you order?
Tell us which curls you are considering and how many boxes per style, and we will send a physical card with curl, thickness and pair count marked on each tray.