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 16 in Nominal Width 1/4 in Actual Inside Dia 15.955 in Actual Width 0.275 in Dash Number 461 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 -VQM 70 FDA 21 CFR 177.2600 Nominal Outside Dia 16 1/2 in Actual Outside Dia 16.505 in Temp Range -65 Degrees to +400 Degrees F