O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Metric Cross Section Shape Round O-Ring Material Viton Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 7.3 mm Nominal Width 2.4 mm Actual Inside Dia 7.3 mm Actual Width 2.4 mm Color Black Durometer 75 Shore A Meets/Exceeds FKM 75 Nominal Outside Dia 12.1 mm Actual Outside Dia 12.1 mm FDA Approved No Package Quantity 50