O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material Viton, Durometer (Hardness) Rating Very Hard, Nominal Inside Dia. 17 1/2 in, Nominal Width 1/4 in, Actual Inside Dia. 17.455 in, Actual Width 0.275 in, Dash Number 464, Color Black, Durometer 90 Shore A, Meets/Exceeds ASTM D2000, SAE J200, Nominal Outside Dia. 18 in, Actual Outside Dia. 18.005 in, Temp. Range -15 Degrees to 400 Degrees F, FDA Approved No