Round Braided Waxed Cotton Cords, BlackSize: about 1.7mm in diameter, about 10yards/roll. âMaterial: Waxed Cord made of colored 100% cotton fibers, finished with Eco-Friendly wax for a smooth and soft feel, Not easy to fray. âThis strong cord is an excellent choice for a variety of jewelry-making projects, including stringing, binding, crafting, Beading, wrapping or knotting.