Joy Lettershop Iron-On Embroidered Number are easy-to-apply to t-shirts, jerseys, sweatshirts, backpacks, scrapbooks and more. Great for school, camps, family reunions, team sports and more. For permanent fabric application, follow ironing instructions. To adhere to other surfaces such as glass, wood, or plastic, simply remove paper backing and press firmly to the surface. Washable & dry-cleanable. Approximately 1 1/2 inch. Cooper Style Letters. Blue.