Star Mercerized Varigated Thread 1200 yards at discount prices! Star Mercerized Cotton Thread Varigated 1200 Yards. Star is an economy spool of cotton thread. It is made of 3 ply, size 30 mercerized 100% cotton. 1200 yards are cross-wound on a cardboard tube with clear shrink wrap sleeve. Ideal for long arm quilters and other high-end users.