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 3/4 in Nominal Width 1/16 in Actual Inside Dia 0.739 in Actual Width 0.07 in Dash Number 018 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 -VQM 70 FDA 21 CFR 177.2600 Nominal Outside Dia 7/8 in Actual Outside Dia 0.879 in Temp Range -65 Degrees to +400 Degrees F FDA Approved Yes