Product material: rubber Product specifications: as the picture details page Method packing: plastic box Product weight: 160g Packing size: 20 * 10 * 3cm Ideal for plumbing and auto repair, garages, workshops, cars, doors, windows, appliances, bearings, pumps, pulleys, etc. These Rubber washers come in a divided and labeled organizer box, which is very convenient for storage and picking. You can save your effort in storing and choosing sizes. They are small, The soft and flexible o rings are simply cling, which is easy to install. This assortment set can meet most plumbing, automotive, and general repair needs. This is a great o-ring set for all and machinists. Note: The data are all manual measurements, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.