100% silk, single faced (with the exception on 100mm size, which is double faced) 12 momme weight satin. Thin and flowy with tight weave and a satin finish on one side and matte finish on the other side. Bias cut silk ribbon is ribbon or "tape" that has been produced by cutting directly from bolts of fabric diagonally along the bias. The result is a flexibly ribbon that drapes and stretches around curves nicely, making it perfect for finishing, edging or lining garments such a wedding veils, hats, blankets and the like. It also makes beautiful ribbon flowers and paper craft embellishments. The edges are unfinished, but will not unravel. Bias silk ribbon has a seam every 1 1/2 or so yards, as this is how it is constructed. It accepts dye readily, but cold dyes, pigmented inks or flow-able paints work best, as there will be 10%-20% shrinkage with heat.