O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Silicone Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 8 1/4 in Nominal Width 3/32 in Actual Inside Dia 8.237 in Actual Width 0.103 in Dash Number 172 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 -VQM 70 FDA 21 CFR 177.2600 Nominal Outside Dia 8 7/16 in Actual Outside Dia 8.443 in Temp Range -65 Degrees to +400 Degrees F