Rocker Patches are sewn on the back of a leather jacket or vest. You would have a center piece patch and add a lower and upper rocker patch to finish it up. It gives it a nice look. There are traditional ways of applying rockers. For example this one here is a lower rocker. Primarily designed to go below your center piece patch. However, I've personally seen some people use them on the upper back of their vests too. Try it out. Place the patches on the back of your vest and see what fits better before deciding to go the traditional route. Today we photographed all our large rocker patches over my hand to show you an idea of what to expect in terms of size. Majority of our rockers measure from 10-12 inches in width, which is a good size patch for the back of any vest. If you are an oversized person wearing a huge vest, remember you don't need to have such a huge patch. In fact a patch more than 12 inches is not a good idea. Your jacket is designed to stretch, sewing a patch too big is going to limit that stretch and make things uncomfortable. So if you are a big guy and you have a big vest, you can still use these patches and there will just be more room left to add more patches to it. You don't need to have a patch to fill up your entire coat. There are always other smaller patches you can add to it. Have a Great Day and RIDE SAFE