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. 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 80-90. 3 ply. 50 weight (Tex 32). 547 yards. #4000 Black.