uxcell 50 Pcs Flexible Nitrile Rubber O Rings Washers 41mm x 44mm x 1.5mm Product Name : Nitrile Rubber O Ring;Material : Nitrile Rubber Inside Diameter : 41mm/1.61";Outside Diameter : 44mm/1.73'' Thickness : 1.5mm/0.06";Color : Black Weight : 16g Package Content : 50x Nitrile Rubber O Rings