Fil Au Chinois - Fil de Lin Extra NEVER LOSE ANOTHER BUTTON AGAIN. Best button sewing thread in the world. Waxed Linen Single Ply Sewing Thread in 50m Capsules - MADE IN FRANCE Black and white available in both no 80 (thicker) and no 100 (thinner) Fil Au Chinois is what Hermes uses for the spine of their neckties. This thread is slightly thinner, though I do have all colors of the Hermes thread if you want it. Used for solid stitching (buttons, leather, necklaces, strong seams, and bindings) Waxed with beeswax, brushed with horsehair and stretched - smooth and resistant to rigid stitches. Finest thread maker in the world. Free shipping in US. World, add $4.