The Popper is built to last. The structure is made of heavy-duty steel, with a solid base design and stake holes for an extra-sure stance. The Popper's strike face is 42in tall, made of AR500 3/8in rifle-rated steel. This reactive target system tings for a good shot, but falls for a better shot. Whether it's to practice for accuracy or to set-up a shooting course, the Popper tests your skills with a true response. Patent Pending.