1. color fastness>4.5grade 2. 8S~40S, rw&dyed,in hanks& on cones. 3. high bulk is permanent. ... 4. used for weaving, knitting Imitation Acrylic High Bulky Yarn(RW, DYED, HB)1. Material: 100% virgin polyester, different from Bosilun ... white yarn and dyed yarn. Imitation Acrylic Yarn (Hank Yarn, RW,HB)