Mettler Silk-Finish Solid Cotton Thread, 547 yd/500m, Dark Charcoal Both solids and multi's are 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 Manufacturer recommends needle size 80-90