YLI Machine Quilting Thread, 3000 yard spool, 40 weight / 3 ply long staple, Egyptian Mercerized 100% Cotton. YLI’s new Machine Quilting Thread is made from the finest long staple cotton found anywhere in the world. This mercerized quilting thread is made expressly for the machine, but hand quilters love it as well. Soft and smooth, with almost no fuzz or lint, you will find it a pleasure! Color: Dark Blue, Color # 015.