O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Metric Cross Section Shape Round O-Ring Material EPDM Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 4.5 mm Nominal Width 1.5 mm Actual Inside Dia 4.5 mm Actual Width 1.5 mm Color Black Durometer 70 Shore A Nominal Outside Dia 7.5 mm Actual Outside Dia 7.5 mm Temp Range -70 Degrees to 300 Degrees F FDA Approved No