... produce various specifications of covered yarn 20000Mt/ Year, and serving warp knitting, circular knitting, waving seamless intimate wear, socks, and other ... we use includes 20d, 30d, 40d, 70d, 140d etc.The nylon we use includes 20d, 30d, 40d, 50d, 70d, 100d, 140d ... knitting machines and small circular knitting machines and so on. nylon covered spandex yarn