MegaBOOM -  Steel Target System, Polycarbonate base BIG BOOM: results in a maximum 150 decible explosion GO GREEN: works for majority of recyclable plastic bottles MULTI-USE: archery, Rimfire, pellets, and high Cal friendly ECO-FRIENDLY: no chemicals used SAFE TO USE: a great product for first time Mega Boomers to try it out THE MEGABOOM BASE: This MegaBOOM STS has a polycarbonate base and an integrated steel target system that is used to connect 1 or 2 liter recyclable soda or water bottles, intended to be used in combination with a bike tire pump. SNUG AND TIGHT: The STS base has a threaded bottle receive on the top, this is used to screw the empty bottle until snug against the O-ring. The included Ballistic Safety Bag can be used when pumping the STS with a bike pump, simply place the STS on its side and lay in the bag while pumping. THE PRESSURE IS ON: After connecting the intact soda or water bottle of your choice, use a bike tire pump or the 160 psi rated MegaBOOM Air Pump to pump until a minimum of 105 psi is reached. LOTTA LOUD: Our products are designed to give you more boom for your buck. We caution that resulting audio outputs of our product may exceed 150 decibels and strongly recommend using hearing and eye protection during pressurization and shooting; stay at least 15 feet from target when shooting. NO CHEMICALS NEEDED: There are no chemicals required to obtain the desired boom with our product. The optional purchase of cloud powder is merely a biodegradable cloud powder that can be added to add a cloud to the loud and grant a maximum cloud dispersion upon the boom.