Paintball is a sport in which players compete, in teams or individually, to eliminate opponents by tagging them with capsules containing water-soluble dye and featuring a gelatin outer shell (referred to as paintballs) propelled from a device called a paintball marker (commonly referred to as a paintball gun). Paintballs are composed of a non-toxic, biodegradable, water-soluble polymer. The game is regularly played at a sporting level with organized competition involving major tournaments, professional teams, and players.