20 Colors of Perle Cotton Set B - 75yds - Size 8 - Threadart This set includes one spool of each of our most popular 20 colors of perle cotton thread. Use for quilting, embroidery, cross stitch, crochet, and more Perle (Pearl) cotton is a heavy weight thread This thread has a beautiful lustrous finish and is 100% mercerized cotton On convenient spools as pictured. Size 8. 75yds per spool