O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material PTFE Durometer (Hardness) Rating Very Hard Nominal Inside Dia 3 3/8 in Nominal Width 1/8 in Actual Inside Dia 3.359 in Actual Width 0.139 in Dash Number 237 Color White Durometer 55 Shore D Nominal Outside Dia 3 5/8 in Actual Outside Dia 3.637 in Temp Range -100 Degrees to 500 Degrees F FDA Approved Yes Package Quantity 2