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 1/4 in Nominal Width 3/16 in Actual Inside Dia 5.225 in Actual Width 0.21 in Dash Number 355 Color Red Durometer 70 Shore A Meets/Exceeds ASTM D2000 FDA Approved SAE J200 Nominal Outside Dia 5 5/8 in Actual Outside Dia 5.645 in Temp Range -65 Degrees to +400 Degrees F FDA Approved Yes