sulky makes a number of different threads, some for quilting, some for embroidery, some for sewing,... the company doesn't really matter, just buy a good machine thread that is 40-50 wt. poly works fine, rayon...cotton thread breaks alot when machine quilting because of the speed of the machine.but sulky is the company that has threads, not the thread itself,like mettler, yli, gutterman, superior, the list goes on and on