O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material EPDM, Durometer (Hardness) Rating Medium Hard, Nominal Inside Dia. 3 5/8 in, Nominal Width 3/16 in, Actual Inside Dia. 3.6 in, Actual Width 0.21 in, Dash Number 342, Color Black, Durometer 70 Shore A, Meets/Exceeds ASTM D2000, EPDM 70, Nominal Outside Dia. 4 in, Actual Outside Dia. 4.02 in, FDA Approved No, Package Quantity 25