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 5 7/8 in Nominal Width 1/4 in Actual Inside Dia 5.85 in Actual Width 0.275 in Dash Number 436 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 -VQM 70 FDA 21 CFR 177.2600 Nominal Outside Dia 6 3/8 in Actual Outside Dia 6.4 in Temp Range -65 Degrees to +400 Degrees F FDA Approved Yes