... co., ltd. is the professional producer of covered spandex yarn, recently possessing one conventional covering factory and one air covering ... as following:Air covered yarn and conventional covered yarnSingle covered yarn and double covered yarnnylon covered spandex yarn and polyester covered spandex yarnthe ... ,30d,40d,50d,70d,100d,140d,200d etc.the polyester we use includes 50d,75d,100d,150d,200d,300d ...