100% bonded thread. 1. polyester bonded thread and nylon thread 2.nylon 6 and nylon 66 ... 6.6 Bonded, general nylon thread for chosen.2. Specification: 21D / 2, 210D / 3, 210D / 4, 210D / 2X3, 280D / 1, 280D / 3 ... to chemical, bacteria, mildew, wear, sunlight abrasion. Azo FREE. Our bonded nylon thread remains unbroken, plies stay together do not split ...