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 122 mm Nominal Width 3.5 mm Actual Inside Dia 122 mm Actual Width 3.5 mm Color Black Durometer 75 Shore A Nominal Outside Dia 129 mm Actual Outside Dia 129 mm Temp Range -15 Degrees to 400 Degrees F FDA Approved No