You choose any 21 Half Inch 1/2 inch (1.27cm) Tall Iron-On Letters or Numbers. Each pack contains 21 Iron-on Letters or Numbers of your choice Total. Come in various fonts, sizes and colors. Easy Application Instructions with home Iron or Heat Press Machine, no sewing required. Print on all fabric colors and work best on Cotton, Polyesters and blends. Durable and machine washable. Fast shipping worldwide.