uxcell 10x 45mm OD 37mm ID Nitrile Rubber O-ring Oil Seal Gaskets Black Product Name : O Ring;Material : Nitrile Rubber(NBR) External Diameter : 45mm / 1.771";Inner Diameter : 37mm / 1.456" Thickness : 4mm/ 0.157";Color : Black Weight : 22g Package Content : 10 x NBR O Ring