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 3 mm Nominal Width 2 mm Actual Inside Dia 3 mm Actual Width 2 mm Color Red Durometer 70 Shore A Meets/Exceeds FDA Nominal Outside Dia 7 mm Actual Outside Dia 7 mm Temp Range -80 Degrees to 450 Degrees F FDA Approved Yes