Gaskets & O-Rings descriptions We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Rubber O-ring Washer Seals, Watertightness Assortment With Plactic Box Kit Set. Features: The Metric Nitrile Rubber(NBR) O-Ring Assortment Holds 225 Rubber O-rings,18 Different Sizes, Ranging in Size from 3mm-22mm. Ideal for Garages, General Plumbers, Mechanics, Workshop, Car, Door, Window, Electric Appliance, Bearing, Pump, Carrier Roller. Wear Resistance, Corrosion Resistance, High Temperature Resistance, High Pressure Resistance. No Pollution, No Radiation, No Abnormal Smell, Environmental Friendly. Nitrile Rubber (NBR), Anti Static, Oil Resistant, UV Resistance, Heat Resistant, Wear Resistant, Durable and Long Service Life. Soft and Flexible O Rings, Simply Snap On, Easy to Install. The 225 Pcs O Ring Assortment Set Can Cater to Most Plumbing, Automotive, and General Repair Needs. Stored in a Labeled and Organized Resealable Case Saves You Effort in Tidying Up and Choosing Sizes. Variety of Thickness and Size Are All in One Box, Very Convenient to Use. Specification: Housing Color: Black Size Types: 18 Material: Rubber Box Size: Approx. 20.5x10.3x3cm/8.07"x4.06"x1.18" (L*W*H) Quantity: 1 Set (225 Pieces) Package Includes: 225pcs X Rubber Gasket (packed with Plastic Box) . Products number : SOMONO88114