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 Very Hard, Nominal Inside Dia. 8 mm, Nominal Width 2 mm, Actual Inside Dia. 8 mm, Actual Width 2 mm, Color Black, Durometer 90 Shore A, Meets/Exceeds ASTM D2000, SAE J200, Nominal Outside Dia. 12 mm, Actual Outside Dia. 12 mm, Temp. Range -40 Degrees to 250 Degrees F, No, Package Quantity 25