O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Kalrez 4079 Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3 1/2 in Nominal Width 1/8 in Actual Inside Dia 3.4 in Actual Width 0.139 in Dash Number 238 Color Black Durometer 75 Shore A Nominal Outside Dia 3 3/4 in Actual Outside Dia 3.762 in Temp Range 30 Degrees to 600 Degrees F FDA Approved No