2 Tone Numbers/letters are the most popular letters that give a great, authentic look to your jersey. 100% tackle twill numbers/letters, also known as fabric numbers/letters. Can be ironed onto your garment using a standard iron or a heat press (recommended). Letters/numbers are thick & durable enough that they can be sewn or stitched down as well to give your garment that quality look. All letters/numbers have a slight 'sheen or shine' to them and have a clear adhesive on the bottom.