EASY TO USE - Use Sublimation Printer to print your favorite photo or text on the patch surface about 200°C(400°F) for 30s, then position it where you want, cover it with a cloth and preheat your iron, iron the patch about 140°C(285°F) for 30s, it will be quickly stuck because of its high temperature glue on the back, iron again on surface for 10-20 seconds to fix it. You can also sew it by machine or by hand for some heavy fabrics that can't be ironed. Patch in rounded rectangle shape, each is approx. 3.94 x 2.37 inches, which is the most commonly used size. You can DIY for your family or share them with your friends to enjoy DIY fun