Works with any steel target but sized for our 8" gongs. Magnetic so it sticks to anything a magnet would. Slap on, paint, remove and blast away. So easy and fast even Joe Biden could use it 8.25" Circle with pull tab CNC cut from durable 45mil magnetic sheet. Perfect for all guns including your AR14, 15 or even 16 INSTRUCTIONS FOR USE: Best if used immediately after a trip to your local grocery store for toilet paper or hand sanitizer.