A buddy has a set that is about perfect. Just a small circle about 1.5" on top and a larger one about 4" on the bottom, on the same shaft. That is, hitting either swings both. We have it out at about 80 yards for silhouette practice. Warm up on the big one and then try the small one. He's been throwing 50 rounds at it, two or three times a week, for a couple of years. One afternoon we got up much closer and poured about 600 rounds into it from a double action Smith 17. It shows no sign of wear. These are really useful pieces of gear!