【Excellent Material】This assortment of O-rings is made of excellent rubber material with high load-bearing capacity and high tensile strength. It is wear-resistant, oil-resistant, difficult to tear, and offers good airtightness and high temperature resistance, so you don't have to worry about leaks. 【Powerful Functions】These rubber seals are easy to apply and install. The various rubber washers can increase the contact surface, reduce pressure, and protect parts and screws, and can withstand temperatures up to 120 degrees Celsius. 【Easy to Carry】These flat rubber seals come with a plastic storage box. The separate compartments keep the O-rings organized, making storage and retrieval very convenient. 【Wide Applications】These rubber seals have a wide range of uses at home and at work, and are ideal for garages, general plumbers, mechanics, workshops, cars, doors, windows, electrical appliances, bearings, pumps, carrier rollers, etc. 【What You Get】You will receive 200 pieces of rubber sealing rings with high electrical resistance in 15 popular sizes, serving various purposes and in sufficient quantity to meet your long-term needs.