JT US-50 Semi Auto 0.50-Calibre Paintball Marker, Green JT Semi-Auto .50 Caliber Paintball Marker Includes: 1 prefilled CO2 Jet & 30 .50 caliber paintballs Cleaning Stick and Barrel Plug Semi Automatic .50 caliber paintball marker, no batteries required 22 round capacity; For best results purchase JT .50 Cal Ammo