Pre-Cut, nylon, iron-on hook and loop set with rounded corners. Easy to apply. 3 pairs in black and 3 sets in white for light and dark fabric. Ideal for shirts, working apparel, overalls, work coats and uniforms. Prevents things for falling out of the pockets. Hidden and invisible. Works best on light to medium fabrics. For heavier fabrics machine stitch around each part is recommended. Can be machine washed at up to 30 degrees.