Backup O-Ring, Material PTFE, Radius Not Applicable, Actual Width 0.053 in, Actual Inside Dia. 0.455 in, Nominal Inside Dia. 29/64 in, Actual Outside Dia. 0.561 in, Cross Section Shape Rectangular, Durometer 55D, Durometer (Hardness) Rating Very Hard, Color White, Temp. Range -100 Degrees to 500 Degrees F, Package Quantity 50