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 3/4 in Nominal Width 3/16 in Actual Inside Dia 5.725 in Actual Width 0.21 in Dash Number 359 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 FDA Approved SAE J200 Nominal Outside Dia 6 1/8 in Actual Outside Dia 6.145 in Temp Range -65 Degrees to +400 Degrees F FDA Approved Yes