O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material FEP with Silicone Core Durometer (Hardness) Rating Hard Nominal Inside Dia 5/8 in Nominal Width 1/16 in Actual Inside Dia 0.614 in Actual Width 0.07 in Dash Number 016 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 3/4 in Actual Outside Dia 0.754 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes