4mm Fall in love with Silk Ribbon River Silks 100% silk ribbon is changing the way you think about silk ribbon. Our ribbon is perfect for needlepoint, embroidery, bobbin stitching, quilting, crazy quilting, knitting, crochet, embellishment, jewelry, heirloom sewing, scrapbooking, invitations, cards, and beyond. Our hand-dyed 100% silk ribbon comes in 4mm, 7mm and 13mm widths, and over 250 colors. Silk Ribbon that doesn't run or fray River Silks 100% silk ribbon is woven individually, not cut from cloth. It has selvedge on both sides and has a high thread count, which makes it the most durable ribbon available.