Measure approx. : x mm 1. Pre-heat iron for 5 minutes on the higher setting No Steam. 2. Bag & denim like cotton to apply patch on it. Thin towel or cloth to cover the patch. 3. Position the heated iron over the patch & press down. Hold the iron there for about 15 seconds. Apply as much pressure as you can by pressing down firmly. 4. Remove the iron & allow the patch to cool. Polyester fabrics should be extra careful because applying the high heat required for ironing may burn or discolor the fabric. Silk & other delicate fabrics are not suitable for patching. Pencil Patch, Iron-On Embroidered