ITEM NAME:160mm x 5mm Industry Flexible Rubber O-Ring Seal Washer G8K3 160mm x 5mm Industry Flexible Rubber O-Ring Seal Washer G8K3 Product Name: Rubber O Ring Material: nitrile rubber (NBR) Weight: 14 g Inner diameter: 150 mm Outer diameter: 160 mm Thickness: 5 mm Color: Black Package Contents: 1 x Nitrile Rubber O Rings Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/-1-3cm..Material: nitrile rubber (NBR). Weight: 14 g. Color: Black.