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 10.1 mm Nominal Width 1.6 mm Actual Inside Dia 10.1 mm Actual Width 1.6 mm Color Black Durometer 75 Shore A Meets/Exceeds FKM 75 Nominal Outside Dia 13.3 mm Actual Outside Dia 13.3 mm FDA Approved No Package Quantity 25