Au Ver à Soie by VALDANI: Pearl Silk (Soie Perlée), Hand-Dyed, Colorfast and Best Quality. These are PURE Filament SILK, the shiniest and strongest natural fiber. The thread is similar to perle size #12. THE ONLY HAND-DYED SILK ON THE MARKET FOR BOTH HAND AND MACHINE. Both for HAND and MACHINE: needlepoint, wool appliqué, stitching, embroidery, hand-sewn embellishments, cross stitching, quilting, ribbon work, knitting, crochet, tatting, smocking, weaving, lace making, braiding, beading, as weaving warp - as it is unbreakable, ornamentation.