This collection contains 31 popular Sulky 40 Wt. PolyDeco thread colors on 250 yd. spools, and Black & White Bobbin thread on 475 yd. spools. PolyDeco thread is great for anything that will spend a lot of time outside or that you plan to wash often with bleach, like beach towels and kids clothing. It is a top quality thread that can take the elements. Seamstresses love Poly Deco when top stitching garments, for its strength and beauty. This is a great collection for the avid "monogrammer" or seamstress.