Product title: Nitrile rubber O-ring Materials: nitrile rubber (NBR) Thickness: 5 mm Colour: Black Inside diameter: 160 mm Outdoors diameter: 170 mm Weight: 16 g Bundlecontent material: 1 x nitrile rubber O ring Solely the above package dealcontent material, differentmerchandiseare usually not included. Notice: Mildcapturing and completely differentshowsmighttriggerthe colour of the merchandisewithin theimagea little bitcompletely different from the truefactor. The measurement allowed error is +/-1-3cm.