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 7 3/4 in Nominal Width 3/16 in Actual Inside Dia 7.725 in Actual Width 0.21 in Dash Number 368 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 -VQM 70 FDA 21 CFR 177.2600 Nominal Outside Dia 8 1/8 in Actual Outside Dia 8.145 in Temp Range -65 Degrees to +400 Degrees F