Charles' Arctic Tundra Thread Pack by Laundry Basket Quilts includes four assorted spools of Wonderfil thread: Three 50wt Konfetti Double-Gassed Egyptian Cotton spools (2500 yards each) and one 40wt Master Quilter cottonized polyester spool (3000 yards). These threads are perfect for machine sewing and longarm quilting, piecing, embroidery, outlining and more.