uxcell 50 x Black 15mm x 2.5mm Nitrile Rubber O-ring Oil Seal Gaskets Product Name : O Ring;Material : Nitrile Rubber(NBR) Quantity : 50 Pcs;External Diameter : 15mm / 0.59" Inner Diameter : 10mm / 0.39";Thickness : 2.5mm / 0.098" Color : Black;Weight : 13g Package Content : 50 x NBR O Ring