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 15 mm Nominal Width 2.5 mm Actual Inside Dia 15 mm Actual Width 2.5 mm Color Black Durometer 75 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 20 mm Actual Outside Dia 20 mm Temp Range -15 Degrees to 400 Degrees F FDA Approved No Package Quantity 10