Product name: Nitrile rubber O RingMaterial: nitrile rubberWeight: nine gInner diameter: eleven mmExternal diameter: 15 mmThickness: 2 mmColor: BlackPackage content: 50 x nitrile rubber O ringOnly the above equipment content, different products aren't included.Note: Light taking pictures and assorted exhibits could cause the colour of the article in the photograph a bit of diverse from the real thing. The dimension allowed error is +/-1-3cm.