uxcell 120mm x 3.5mm Black Nitrile Rubber O Ring NBR Sealing Gaskets 10 Pcs Product Name : O Ring;Material : NBR(Nitrile Butadiene Rubber) Color : Black;Inside Diameter : 113mm/ 4.45" Outside Diameter : 120mm/ 4.72";Thickness : 3.5mm/ 0.14" Weight : 50g Package Content : 10 x O Rings