Can be ironed on, sewn on, or glued on to anything! Dimensions: 3" Round Iron On Instructions Using a Household Iron: 1. Pre-heat iron to the med-high cotton temperature setting (without steam) and select a hard, flat pressing surface (not a padded ironing board). 2. Position patch on pre-washed garment and cover with the included patch pressing sheet. 3. Using iron, apply constant pressure to pressing sheet for 30-40 seconds (no back and forth). 4. Turn garment inside out and repeat, pressing directly on garment to heat though back of patch. 5. Enjoy! (the glue on your new patch should last for about 50 washes)