O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material FEP with Viton Core Durometer (Hardness) Rating Very Hard Nominal Inside Dia 3 in Nominal Width 3/16 in Actual Inside Dia 2.975 in Actual Width 0.21 in Dash Number 337 Color Clear with Black Core Durometer 90 Shore A Meets/Exceeds ASTM D2116 Nominal Outside Dia 3 3/8 in Actual Outside Dia 3.395 in Temp Range -15 Degrees to 400 Degrees F FDA Approved Yes