Iron-On Letters Patches - Approx. 1.85 x 1.41 inches There is no limit to your imagination.Do you want to decorate your clothes and need one or more letters or numbers to iron? Do you want to cover up a small hole? Or do you want to make a personalized gift for your loved ones? The patches are coated with a special adhesive that melts when heated and thus adheres well to textiles. Simply place the patch in the desired location and iron it. Our thermal adhesive patches are also ideal for masking unsightly stains or holes.Why do the patches hold up after ironing? When ironed, the heat from the iron melts the special textile glue on the back of the patch and hardens again after it cools. This bonds the patch fabric to the background fabric.How long should I iron when ironing on patches? Ironing time should be 20-30 seconds. You should apply medium pressure and work all areas of the patch. Then iron the edges and tips again.At what temperature should I iron the patches? When ironing patches, the iron should be set on the highest setting so that the textile adhesive on the ironing surface on the back of the patch melts well.Ironing is easy: Place the coated appliqué on the backing and cover it with silicone paper or baking paper. Press firmly with an iron (3 points) for 10-15 seconds. For better adhesion, also iron the application on the back of the backing paper.