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. 28 mm, Nominal Width 2.5 mm, Actual Inside Dia. 28 mm, Actual Width 2.5 mm, Dash Number Not Applicable, Color Black, Durometer 70A, Meets/Exceeds NBR 70, Nominal Outside Dia. 33 mm, Actual Outside Dia. 33 mm, FDA Approved Not FDA Approved, Application Standard