Signature 100% Cotton Quilting Thread is the perfect choice for those sewers or quilters that prefer cotton. With excellent sewability at high speeds this lower lint, high luster cotton thread performs well on both longarm quilting and home sewing machines. 100% Long-Staple Mercerized Cotton. 40 weight, 3 ply. 3000 yards. #M05 Denim - shades of Light to Dark Blues.