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 Viton, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 30 mm, Nominal Width 4 mm, Actual Inside Dia. 30 mm, Actual Width 4 mm, Dash Number Not Applicable, Color Black, Durometer 75A, Meets/Exceeds FKM 75, Nominal Outside Dia. 38 mm, Actual Outside Dia. 38 mm, FDA Approved Not FDA Approved, Application Standard