you can get 40 wt, up to 60wt polyester thread from connecting threads- 60wt is thinner/finer than 40wt. I think the cotton quilting thread is 40wt- which is a heavier thread. the higher the weight number the finer the thread. 12 weight thread is like 6 strands of embroidery floss- 100 wt silk thread is fine like a strand of hair.