Features:This 279 pieces assorted O-ring set is perfect for automotive, commercial and hydraulic use. Features with 18 kinds of the most used sizes to accommodate a wide variety of tasks. Constructed of premium rubber, these rings will resist heat, oil, gas, water and most silicone fluids and solvents. The o-rings come in a labeled and organized storage case which makes it easily to choose the correct size. This is a great o-ring set for any auto mechanics and machinists.Specifications:Condition: Brand new and high qualityMaterial: RubberColor: BlackWeight: 200gO-Ring Size and Quantity: As the following picture shownO-Ring QuantitySize(internal diameter * thickness)20pcs3 * 1.5mm20pcs4.4 * 2mm 18pcs5 * 2mm23pcs7 * 1.5mm23pcs10 * 1.5mm23pcs13 * 1.5mm13pcs19 * 2.5mm14pcs21 * 2.5mm13pcs22 * 2.5mm 10pcs18 * 3.5mm10pcs20 * 3.5mm10pcs22 * 3.5mm14pcs10 * 2.5mm13pcs11 * 2.5mm14pcs13 * 2.5mm13pcs14 * 2.5mm14pcs16 * 2.5mm14pcs18 * 2.5mmPackage Included:1 * Kit of 279pcs O-Rings