This is a hand quilting thread for all fabrics. It is designed to be a strong, all-purpose, hand quilting thread. Because it has a glace finish, it does not tangle, knot, or twist while hand sewing. The glace finish also reduces abrasion on the thread which can cause fraying. Trap spool keeps thread storage tidy. And the spools are easily identified by their green color. Each spool contains 325 yards.