I use the Egyptian cotton 50 weight thread from Connecting Threads. There are 1200 yards on each spool and the threads comes in almost every color imagineable. I like the amount of thread on these spools because normally I can piece a whole quilt with one spool (including bobbin fill-ups). I use neutral colors to piece my tops...cream, gray or black if needed. The price is always right and from time to time they have 40% off sales and that's when I really stock up! Hugs, Barb