DritzÂ® Iron On Numbers, Letters and Graphics are a quick and easy way to personalize home decor projects, backpacks, tote bags, jackets, T-shirts, and other clothing and craft items. Bonds permanently to fabric and paper. Not recommended for synthetic fabrics. Turn garment inside out and machine wash and dry. For best results read and follow all instructions. Letters Athletic Reflective Silver- Upper case letter, 1 or 2 of each. They are approximately 1 5/8"x 1.5".