The Caldwell Magnum Rifle Gong is a high quality, extremely durable steel Gong designed to withstand repeated shots from all calibers of high-powered rifles and handguns. For those shooter who are not in need of the entire Magnum rifle Gong systems, Caldwell is now offering just the steel Gong plate. The Gong has a 10 in. diameter and is 3/8 of an inch thick. Constructed of industry leading AR550 steel tested to a Brignell hardness of 550, the Magnum rifle Gong can take a hit and keep on swinging. The Magnum rifle Gong is designed to be shot at a minimum distance of 100 yards..