Paintballs are small, round capsules filled with a non-toxic, water-soluble dye. They are typically made of a gelatin shell that breaks upon impact, releasing the colored liquid inside. Paintballs are commonly used in the sport of paintball, where players compete in teams to eliminate opponents by hitting them with these projectiles. The standard size of a paintball is .68 inches in diameter, although other sizes exist for different types of games. Paintballs are designed to be fired from paintball markers, which are specialized guns that use compressed air or CO2 to propel the paintballs at high speeds.