All paintball markers use air pressure from an air tank or 12-gram cartridges to fire a paintball. The velocity of the paintball leaving the barrel is usually 250 to 300 feet per second (fps)

300 fps is the maximum allowed at tournaments while 290 fps is the maximum on most playing fields. Air tanks come in different sizes. The bigger the tank, the longer you can play before requiring a refill. Sizes begin at 4 oz. and go up to 20 oz.