I use the thick rubber horse stall mats found at tractor supply. Somewhat self healing, they last well.
John
John, I was just looking at them at a local store (similar to Tractor Supply)......thinking that may be good for my purpose. My wife and I discussed it about a week ago, and she didn’t think it would work well.....I’m glad to hear that it works well. I assume that you “staple” your targets to the mat! memtb