O-Ring, Not Metal Detectable Metal Detectable, Not X-Ray Detectable X-Ray Detectable, System of Measurement Metric, Cross Section Shape Round, O-Ring Material Buna N, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 27 mm, Nominal Width 2 mm, Actual Inside Dia. 27 mm, Actual Width 2 mm, Dash Number Not Applicable, Color Black, Durometer 70A, Meets/Exceeds NBR 70, Nominal Outside Dia. 31 mm, Actual Outside Dia. 31 mm, FDA Approved Not FDA Approved, Application Standard