Strong bonded nylon 40's, a tough sewing thread made from high tenacity polyamide filaments. It offers high seam strength, excellent abrasion resistance, seam stretch recovery and heat resistance during the sewing process. Bonding additionally improves sewing performance at high speeds and increases machine efficiency during sewing. Used in footwear, upholstery, leather goods, automotive and horse rugs. 3,500 metre spool.