10 items of black rubber oil, O rings, tremendous material, oil resistance, abrasion resistance and water-resistant seal.O-rings are donut-shaped rings in the industry for preventing liquid or gasoline from leakage or leaking in an application.Suitable for either static and dynamic sealing.Product Name: O RingMaterial: rubberColor: BlackOuter diameter: 38mm / 1.5 inchInner diameter: 32mm / 1.3 inchThickness: 3mm / 0.1 inchPackage Included:10 x o-ring gasket washersOnly the above equipment content, different products aren't included.Note: Light taking pictures and varied displays can cause the colour of the thing within the picture a little different from the genuine thing. The size allowed error is +/-1-3cm.