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 1 3/8 in Nominal Width 1/8 in Actual Inside Dia 1.359 in Actual Width 0.139 in Dash Number 220 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 1 5/8 in Actual Outside Dia 1.637 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes