Sulky makes 30 wt and 12 wt in the cotton threads (pretty sure their rayon is 40 wt). I used 30 wt for a competition quilt because Sulky was a sponsor and using it made you eligible for additional prizes.
I will never use it again and am now stuck with 17 spools of multiple colors of the stuff. It breaks, leaving fluffy ends, and is really annoying to unstitch for that reason as well. My longarmer almost refused to finish quilting the piece with it because it broke so often. She'll never use it again either.
I do use the 12 wt for decorative hand stitching, but Sulky will never see my sewing machine again. And the competition? Every entrant received...you guessed it...a free spool of Sulky thread. Big whoopie... :roll: