Mettler Silk Finish Cotton Thread is top quality mercerized cotton thread with a silk-finish, it is soft and lustrous, shrink resistant and safe to iron. Perfect for piecing, fine stitching and fine embroidery. This thread is colorfast and fade resistant, boil proof, and suitable for machine and hand sewing. 100% Long Staple Egyptian Cotton. Manufacturer recommends needle size 70-80. 2 ply. 50 weight. 164 yards. #0818 Sweet Boy.