3K, 12K and 18K refer to the number of carbon filaments in a tow: approximately 3,000, 12,000 and 18,000. They are material descriptions, not universal quality grades. To compare finished padel rackets, read the core, construction, shape, balance and weight alongside the K number.
What K actually counts
A tow is a bundle of carbon filaments used to make a reinforcement. Toray’s carbon-fibre reference distinguishes tow size from fibre properties such as tensile strength and modulus. The same tow size can appear in different fibre grades.
That distinction matters when shopping: a larger filament count does not, by itself, prove a stronger, stiffer or more expensive finished racket. It also does not describe the whole amount of carbon in the racket, its number of layers or the quality of its manufacture.
Why two rackets with the same number can feel different
The face works as part of a structure. Fibre grade, fabric architecture, layer orientation, resin, frame design and the foam core all contribute to the finished response. Shape and mass distribution affect handling. Changing several of these at once prevents a clean conclusion that “the K number caused the difference”.
Read Soft, Medium and Hard as the maker’s core descriptions, not a standardised scale shared by every brand. Without comparable measurements, a label cannot tell you exactly how one brand’s core compares with another’s.
How Eterna combines the materials
| Model | Face / core | Shape / balance | Listed weight |
|---|---|---|---|
| Miami Rose | 3K / EVA Soft | Round / even | 355 g |
| Monaco Red | 3K / EVA Soft | Diamond / head-heavy | 355 g |
| Bel Air Green | 12K / EVA Medium | Teardrop / even | 365 g |
| Soho Blue | 12K / EVA Medium | Teardrop / even | 365 g |
| Tribeca Laser Black | 18K / EVA Hard | Diamond / head-heavy | 365 g |
These are current Eterna catalogue specifications. Matte and Glossy editions within a family share the listed playing profile. Eterna’s control/power percentages are brand descriptions, not laboratory measurements or an industry comparison scale.
What the comparison can—and cannot—show
Miami Rose and Monaco Red make the point clearly: both use 3K faces and soft cores at the same listed weight, yet their shape and balance differ. A player choosing between them needs to compare preparation and contact on court.
Tribeca combines an 18K face with a hard core and head-heavy diamond design. Its advanced positioning belongs to that complete profile. It does not mean every 18K racket on the market behaves the same way, or that an experienced player must prefer it.
Choose with a repeatable test
Compare similar shots using the same balls and conditions: controlled volleys, defensive returns, lobs and overheads. Note how easily you prepare, how consistently you find the contact you want and how the grip feels through a session. A single hard smash is a narrow test.
Use shape and weight and balance to narrow a shortlist, then check the full racket guide. Choose the combination that suits your game rather than the largest number on the frame.
