Mettler’s Silk-Finish Cotton 50 wt. 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 with confidence to create your heirloom quilts, custom garments and creative projects. Recommended needle sizes: 80/12 and 90/14