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 22 mm Nominal Width 3 mm Actual Inside Dia 22 mm Actual Width 3 mm Color Black Durometer 75 Shore A Nominal Outside Dia 28 mm Actual Outside Dia 28 mm Temp Range -15 Degrees to 400 Degrees F FDA Approved No