419 rubber O-rings in a box and 32 types of O-rings per sizeSoft rubber O-rings to seal contact and connection pointsThe kit rubber o rings is perfect for professional filling, supplies, tools, automotive, garage, plumber, mechanics, workshops, repairs, air and gas connections.O-rings are widely used by professional mechanics and car owners to repair engine leaks and other leaks such as oil, coolant, power steering fluid, washer fluid ice cream etc. O-rings can also be used by plumbers and DIY homeowners to seal pipes and repair leaks in sink pipes, tubs, septic lines, etc.Comes in a case of sturdy plastic storage keeps each size separate and organized; portable and can be carried anywhere you go or stored in a tool box or storage rack