... yarn raw white Z &S excellent quality and competitive price nylon covered spandex yarn:Hangzhou uniwell textile co., ltd. is the ... we use includes 20d,30d,40d,70d,140d etc.the nylon we use includes 20d,30d,40d,50d,70d,100d,140d ... produce most specifications, which means you can customize the covered yarns you want.Covered spandex yarn is broadly used for socks ...