Metallic Yarn Specifications: 1) Mainly types: H, X, M, J, B. 2) Content: metallic yarn, 70d/30d x 2nylon, 68d/7 Metallic Yarn Specifications ... :1) Mainly types: H, X, M, J, B.2) Content: metallic ... yarn, 70d/30d x 2nylon, 68d/75d, polyester and other ...