100%silk. Silk Ribbon is soft and pliable making embroidery stitching a pleasure. Unlike polyester, silk does not fray or become tattered during stitching. Silk Ribbon has become a true basic, being used for not only ribbon embroidery but also in place of conventional satin ribbons for home decor projects, gifts, frames, embellishments and more. Vibrant colors , variegated colors and sheers combine to make silk ribbon a dazzling display.