material:polyester yarn+rubber sise:37#,42#,52#,63#,90#etc packing:250g, ... elastic yarn/elastic covered yarn/polyester covered elastic yarnmaterial:polyester yarn+rubber specification:37#,42#,52#,63#,90#etcpacking:250g,500g,1kg/ cone,etcminimum ... design with different material according to customer' requirements. covered elastic yarn