O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Metric, Cross Section Shape Round, O-Ring Material Buna N, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 3.4 mm, Nominal Width 1.9 mm, Actual Inside Dia. 3.4 mm, Actual Width 1.9 mm, Color Black, Durometer 70 Shore A, Nominal Outside Dia. 7.2 mm, Actual Outside Dia. 7.2 mm, Temp. Range -40 Degrees to 250 Degrees F, FDA Approved No, Properties Resistant to Oils, Resistant to Water, Application Standard