O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Metric Cross Section Shape Round O-Ring Material Kalrez 4079 Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 14 mm Nominal Width 2 mm Actual Inside Dia 14 mm Actual Width 2 mm Color Black Durometer 75 Shore A Nominal Outside Dia 18 mm Actual Outside Dia 18 mm Temp Range 30 Degrees to 600 Degrees F FDA Approved No