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 18 mm Nominal Width 2 mm Actual Inside Dia 18 mm Actual Width 2 mm Color Black Durometer 70 Shore A Nominal Outside Dia 22 mm Actual Outside Dia 22 mm Temp Range -70 Degrees to 300 Degrees F FDA Approved No