uxcell 50 Pcs 18mm x 2mm Automobile Sealing NBR O Rings Washers Product Name : O Ring;Material : Nitrile Rubber(NBR) Quantity : 50 2%;External Diameter : 18mm / 0.708" Inner Diameter : 14mm / 0.551";Thickness : 2mm/ 0.078" Color : Black;Weight : 12g Package Content : 50 2% x NBR O Ring