Richword 60 colors of polyester embroidery & sewing thread spools. Great for BAI Embroidery Machines, Brother PRS100, and all other embroidery and sewing machines. Each spool is 40 W.T. (108D/2) thick and 4000M (4374Y) long. Our threads are made of high-quality polyester material, with high gloss and bright colors. And they have the advantages of wear resistance and washability. These make the threads very suitable for all embroidery machines, including household, semi industrial, industrial, and commercial embroidery machines.