From Singer: Iron-On Patches 5"X5" 4/Pkg. Colors: navy, dark brown, dark green, and black. Low heat-for permanent press and other fabrics. 100% cotton. Low heat directions. Use dry iron only-no steam. Washable and super sealing for mending and decorating shirts, jeans, skirts, and jackets. Not recommended for use on nylon, or rayon, or fabrics made of monofilament (non-fibrous strand) polyesters.