SINGER-Iron-On Patches Assorted Sizes. This repair kit is a must have for every household. Patches are 80 Polyester and 20 Cotton. These patches are wasahable and super sealing for decorating and mending shirts, jeans, skirts and more. This 5-3/4x7-1/2 inch package contains four large 5x5 inch patches, four medium 3x3 inch patches and eight small 2x3 inch patches. Use a dry iron only, no steam. Note Not intended for use on plastic, nylon, rayon or fabrics made of monofilament polyesters. Imported.