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1.Yarn count: can produce 7-40s polyester or T/R 90/10% or AB yarn(T/R+COTTON) with 20D-150D spandex in many colors according to your requirement
2.This kind of polyester with spandex yarn is widely usded for denim, socks and some other knitting using.
3.High tenacity: about 1600cN
4.Good draw ratio: 1:3.4, also can make acccording to your requirement.