All The Thread Is High-Quality Spun Polyester Machine Sewing Thread, 100% Polyester. All-Purpose Domestic Sewing Thread Set Which Comes Delivered In A Cardboard Box. It Won'T Deform By Squeezing Sewing Thread And Is Designed With Superior Strength And Durability, Which Is Colourfast, Washable And Have No Breakage. The Spools Are Made From Cardboard, Stronger Than The Thread Reels Made From Paper. It Won'T Deform By Squeezing.