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 3 1/4 in Nominal Width 1/8 in Actual Inside Dia 3.234 in Actual Width 0.139 in Dash Number 236 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 3 1/2 in Actual Outside Dia 3.512 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes