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 20 mm Nominal Width 1.5 mm Actual Inside Dia 20 mm Actual Width 1.5 mm Color Black Durometer 70 Shore A Nominal Outside Dia 23 mm Actual Outside Dia 23 mm Temp Range -70 Degrees to 300 Degrees F FDA Approved No