Polyester Ring Spun for sewing thread RW and Optical. Count : Ne20/1,24/1,30/ ... 1,40/1,50/1,60/1 and 2ply,3ply. Polyester ... Ring Spun for sewing thread RW and Optical.Count : Ne20/1,24/1,30 ... /1,40/1,50/1,60/1 and 2ply,3ply. Polyester sewing thread ...