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.0mm W,PK50 16 mm, FDA Approved No, Package Quantity 50. O-Ring,Buna N,2. 16 mm, Actual Outside Dia.