This 180 piece Players Kit JR contains 18 of the most common sized o-rings found in paintball equipment (10 of each size) * Keep the o-rings on hand to replace seals in a variety of paintball equipment including your marker, to your air/CO2 tank, and other accessories requiring o-rings. * Kit includes o-rings sorted by size in individual compartments. * All of our o-rings exceed ASTM standard. We are proud to offer the highest quality products in the industry.