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 7 1/4 in Nominal Width 1/4 in Actual Inside Dia 7.225 in Actual Width 0.275 in Dash Number 442 Color Clear with Red Core Durometer 85 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 7 3/4 in Actual Outside Dia 7.775 in Temp Range -75 Degrees to 400 Degrees F FDA Approved Yes