... white and black 3.The product is hi-performance bare spandex yarn 4.Good flexibility Detailed Product Description The main product ... ,560D,720D,840D,etc. We can produce white and black spandex.Usage: Covering core, air interlacing yarn, circularly knitting, warp ... )certification & Oeko-certification class 1. Scale:Phase 1 project Ruyi Spandex has an investment of RMB 300million by Shandong Ruyi science ...