... mulberry spun silk and silk sliver manufacture since 1986. A1+, B2+, C3+, A1, B2 Dear Sir,/Ms We are TONGXIANG HESHAN WEIYE ... , 170nm/2, 210nm/2, 240nm/2, 300nm/2 and A1+;B2+;C3+;A1,B2Except the silk yarn ,we also produce silk silk ... sliverand silk ball.A1 grade A grade and so on . Hoping to coopearate with ...