We supply all the hardware (10 gong) along with proof chain, leg stands, and nuts & bolts - no lumber required. Simple 30-second setup (initial assembly time of about 10 minutes). Four florescent orange target face stickers included with each gong. Gongs are manufactured from AR500 steel (3/8" thickness) for long lasting durability. This system gives you an audible "ping" when the target is struck and it will settle back down for another shot after 10 seconds or so (depending on how long you set your chains to the gong). Use with any high-velocity 30 caliber and under (at a 100 yard minimum distance). Try one out - it's fun and you can shoot for hours without having to reset your target!Always follow safe shooting rules as set forth by the NRA and NSSF.