Mettler Silk-Finish 100% Mercerized Cotton Thread; 50wt; 500m/547 yd Spools SILK-FINISH COTTON 50 is the perfect sewing and quilting thread for your finest cotton creations. The high-quality thread boasts a luxuriously soft effect and has a supple feel. SILK-FINISH COTTON 50 is avaiable in a wide choice of colors and different spool sizes. The larger spools are perfectly suited for longarm-quilting. Through the mercerization process, SILK-FINISH COTTON 50 reaches a high breaking point, high heat resistance, and has reduced shrinkage.