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 24 mm Nominal Width 3 mm Actual Inside Dia 24 mm Actual Width 3 mm Color Red Durometer 70 Shore A Meets/Exceeds FDA Nominal Outside Dia 30 mm Actual Outside Dia 30 mm Temp Range -80 Degrees to 450 Degrees F FDA Approved Yes