Mettler silk-finish cotton thread is perfect for all your quilting, sewing and long arm cotton needs. The mercerization of all Mettler cottons creates that beautiful silk-like sheen, high breaking resistance, color fastness and optimal elongation. Use Mettler’s silk-finish cotton 50 with confidence to create your heirloom quilts, custom garments and creative projects. Tex 32. Manufacturer recommends needle size 80-90.