uxcell 50x NBR 30mmx1.5mm Hole Sealing O Rings Gaskets Washers for Mechanical Product Name : O Ring;Material : Nitrile Rubber(NBR) Quantity : 50 Pcs;Outside Diameter : 30mm / 1.18" Inner Diameter : 27mm / 1.06";Thickness : 1.5mm / 0.059" Color : Black;Weight : 13g Package Content : 50 x NBR O Ring