Caldwell Magnum Rifle Gong Complete Kit Certified AR550 Steel 9.25" Diameter Caldwell Magnum Rifle Gong is designed to withstand bullet impacts without compromising the gong integrity Frame constructed of steel tubing and requires no tools to assemble or disassemble Designed to be shot at a minimum distance of 100 yards, for maximum life expectancy impact velocities of 3,000 fps and below are recommended Entire system packs down for easy transportation Constructed of industry leading AR550 steel tested to a Brinell hardness of 550