I have several spools of STAR thread. On one end it says Coats & Clark, size 50 Mercerized Cotton, Machine Quilting & Craft. I picked it up during a sale at a variety store well known for it's quilting supplies, and these spools are wooden. Although I have not broken the wrapping and used it yet, I did read testimonials regarding STAR thread. Try googling "STAR quilting thread reviews" or something similar. Usually the less you say in a search, the better chance of finding information.