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 7.5 mm Nominal Width 1.5 mm Actual Inside Dia 7.5 mm Actual Width 1.5 mm Color Black Durometer 75 Shore A Nominal Outside Dia 10.5 mm Actual Outside Dia 10.5 mm Temp Range 30 Degrees to 600 Degrees F FDA Approved No