Iron on/Sew on letter packs allow you, the customer to buy in bulk. Same 100% authentic tackle twill letters in a pack of 10. Letters are iron on or sew on/stitch on for baseball, football, hockey or basketball jerseys or uniforms. Can be used for soccer, letterman jackets and many other twill applications. Each letter has a heat sensitive backing called HPO and can be applied with a simple household iron. You will receive 10 of the same letter when ordering number packs. Each number or letter can be used as an iron on application, or a sew on/stitch on application. Ironing on each character, will have a temporary hold, however sewing on/stitching on will be permanant.