 outdoor ranges. Now, as for the self-healing part, the six-inch dueling tree plates react and flip back and forth when hit, leaving only a pinhole in the self-healing target plate. Sounds very interesting to me. If you want to find out more, go to their website. You'll find it at thromtargets.com. That's thromtargets.com. And this reminds me, I need to get out to the range myself sooner than later.