O-Ring, Not Metal Detectable Metal Detectable, Not X-Ray Detectable X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material FEP with Core, Durometer (Hardness) Rating Very Hard, Nominal Inside Dia. 1 7/8 in, Nominal Width 3/16 in, Actual Inside Dia. 1.85 in, Actual Width 0.21 in, Dash Number 328, Color Clear with Black Core, Durometer 90A, Meets/Exceeds ASTM D2116, Nominal Outside Dia. 2 1/4 in, Actual Outside Dia. 2.27 in