... colors and specifications 32#,37#, 42#, 52# 1.High elasticity thread, Covering with polyester yarn or nylon yarn, used for sewing, ... knitting, weaving process. The rubbers are often 5 specifications 23#,32#,37#, 42#, 52#.2 ... Machine, we also have Texturing Machine, Leaser, Cover Yarn Machine(for making elastic threads). White/Black Elastic Rubber Covered Yarn