... +, A1, B2 We are specialized in mulberry spun silk and silk sliver manufacture since 1986.We can supply the model number ... produce 100% spun silk yarn, and also dealing with silk/cotton, silk/Viscose, silk/cashmere, silk/bamboo, silk/wool,dyed silk yarn,melange coloure silk yarnand so on. ... and A1+;B2+;C3+;A1,B2Except the silk yarn ,we also produce silk silk sliverand silk ball.A1 grade A grade and so ...