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 2 in Nominal Width 3/16 in Actual Inside Dia 1.975 in Actual Width 0.21 in Dash Number 329 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 2 3/8 in Actual Outside Dia 2.395 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes