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 40 mm Nominal Width 4 mm Actual Inside Dia 40 mm Actual Width 4 mm Color Red Durometer 70 Shore A Meets/Exceeds FDA Nominal Outside Dia 48 mm Actual Outside Dia 48 mm Temp Range -80 Degrees to 450 Degrees F FDA Approved Yes