The EZ-Aim Hardrock AR500 Target is made of 1/2″ thick armor plate steel to withstand the impact from high power hunting rifles. The white Powder Coat finish shows bullet impacts. EZ-Aim Hardrock gongs have three connection points: two at the edge for attaching chains or straps and one in the center for gong hook attachment: Dimensions 4″ diameter and 1/2″ thickness.