... Description The main product is hi-performance bare spandex yarn, 15D,20D,30D,40D,70D,105D,140D,210D,280D ... produce white and black spandex. Usage: Covering core, air interlacing yarn, circularly knitting, warp knitting, weft knitting, stockings, covering ... evenness,stability and thermal resistance. Certificate:Jining Luyi hi-tech fibre Co.,Itd. has passed ISO9001(2000)certification & Oeko- ...