uxcell 10Pcs NBR 54mm x 2mm Hole Sealing O Rings Gasket Washer for Automobile Product Name : O Ring;Material : Nitrile Rubber(NBR) External Diameter : 54mm / 2.125";Inner Diameter : 50mm / 1.968" Thickness : 2mm/ 0.078";Color : Black Weight : 7g Package Content : 10 x NBR O Ring