Premium Material: These O-rings are made of outstanding nitrile rubber (NBR) with good airtightness and high temperature resistance, which has high resilience and high tensile strength, not easy to tear, sturdy and durable for long term use. Easy to Use: Soft and flexible O-ring, easy to install. Used for sealing gasoline, diesel oil, lubricating oil, water, air, gas and great for most plumbing, automotive and general repair needs. Easy to Carry: The O-rings are stored in a plastic box with size and quantity label. Easy to carry and use. These assorted rubber O-rings are easy to store and carry, which can also save space. Wide applications: The rubber rings are perfect for garages, plumbers, workshops, cars, doors, windows, electrical appliances, bearings, pumps, drain plugs. Can prevent metal-to-metal contact, protecting wiring, cables passing through firewalls, metal panels, etc. Package includes: 200 pieces rubber O-rings in 15 commonly used sizes, the sufficient quantity is enough to meet your long-term use. These faucet O-rings are non-static, oil-resistant, heat-resistant up to 120, wear-resistant and durable.