"Viscose Sizing Silk N-7" by Habut Textiles is a companion or carry-along yarn. Made of silk, it has 3-5% rayon sizing on the surface. This sizing is permanent. It can be hand washed and dried flat. Made of a single, flat ply. When combined with other yarns, this yarn is suitable for making hats, scarves, sweaters, vests and shawls.