Premium Material: These assorted o rings are made of outstanding rubber material with good air tightness and high temperature resistance, which are oil resistant, heat resistant, wear resistant and durable for long time use. 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 a divided and labeled storage box, you can save your efforts to find and choose the size, 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 360 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.