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 mm Nominal Width 1 mm Actual Inside Dia 4 mm Actual Width 1 mm Color Black Durometer 70 Shore A Nominal Outside Dia 6 mm Actual Outside Dia 6 mm Temp Range -70 Degrees to 300 Degrees F FDA Approved No