ITEM NAME:Flexible Nitrile Rubber O Ring NBR Seal Grommets 160 mm x 170 mm x 5 mm E1A7 Flexible Nitrile Rubber O Ring NBR Seal Grommets 160 mm x 170 mm x 5 mm E1A7 Product name: Nitrile rubber O-ring Material: nitrile rubber (NBR) Thickness: 5 mm Color: Black Inside diameter: 160 mm Outside diameter: 170 mm Weight: 16 g Package content: 1 x nitrile rubber O ring 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.