O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material Viton, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 6 1/4 in, Nominal Width 3/32 in, Actual Inside Dia. 6.237 in, Actual Width 0.103 in, Dash Number 164, Color Black, Durometer 75 Shore A, Meets/Exceeds ASTM D2000, SAE J200, Nominal Outside Dia. 6 7/16 in, Actual Outside Dia. 6.443 in, Temp. Range -15 Degrees to 400 Degrees F, FDA Approved No