This assortment contains 104 of sulky"s most popular 250-yard slim spools of Sulky 40-weight polyester thread, a top quality, strong, 100-percent polyester, shiny thread that is especially suited for applique and embroidery on children"s clothing, work clothes, sports clothes, or any garment that will need to be washed frequently and a super convenient molded plastic transparent carry/storage case measuring 14-1/2 by 14-1/2 by 2-1/8-inch with a variety of storage options-closed, partially open on a table/counter top or fully open and mounted on the wall-the choice is all yours. Made in USA.