Our ingenious Auto-Popper® also comes in a lighter weight version for use with .22 caliber rimfire arms. This target is designed the same as our standard Auto-Popper®, but has a lightweight spring that allows the target to react to the .22 bullet. The target itself is ¼" 400 Brinell steel. The .22 Auto-Popper® is available in the standard shape as well as a ground squirrel shape. These targets are great for kids!