Great airgun fun. When the colored kill zone is hit, the target falls. To reset, simply pull the cord. Target and kill-zone reducers are solid steel construction. Includes anchoring stakes and reset pull cord. These targets are intended for use with .177-cal lead pellets only. Kill zone is 1-1/2" diameter Includes 150-ft reset string, 4 stakes and 4 kill-zone reducers: 1-1/8", 3/4", 1/2" and 3/8" 6.5"x6.5"x8" While Gamo does not provide a max velocity or energy for this target, field target clubs in the U.S. usually limit guns to 20 ft-lbs or less. You will damage the target (and possibly the mechanism) if you shoot at it with alloy or non-lead pellet, more powerful guns or larger-caliber pellets.