Each patch is approx. 2 x 3 inches. Apply patch by placing on any surface, cover it with a cloth (to avoid scorching patch) and preheat your iron, iron the patch about 140C(285F) 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. Great for jackets, shirts, pants, caps and beanies