Material: These assorted o rings are made of outstanding rubber material with air tightness and temperature resistance, which are oil resistant Easy to Use: Soft and flexible rubber seal o ring, just clip it on, easy to use. Rubber o-rings can prevent metal-to-metal contact thereby protecting wiring, cables running through firewalls, metal panels, and so on Easy to Carry: These rubber o-ring washers are packed in storage box, which is convenient for your storage and picking Wide Applications: Widely used as sealing rings and washers for the connectors of hydraulic machines, pipelines, etc. Ideal for plumbing, auto repair, garage, workshop, automobile, door, window, appliance, bearing, pump, pulley, etc Package Includes: You will receive a total of 740 pieces of rubber o-rings in 24 commonly used sizes, the sufficient quantity is enough to meet your long-term use and meet a variety of tasks. The hydraulic seals are delicate, fine and rigorously functional