O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Metric Cross Section Shape Round O-Ring Material Silicone Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 12.5 mm Nominal Width 1.8 mm Actual Inside Dia 12.5 mm Actual Width 1.8 mm Color Red Durometer 70 Shore A Meets/Exceeds FDA Nominal Outside Dia 16.1 mm Actual Outside Dia 16.1 mm Temp Range -80 Degrees to 450 Degrees F FDA Approved Yes