O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material HNBR, Durometer (Hardness) Rating Hard, Nominal Inside Dia. 3 7/8 in, Nominal Width 1/8 in, Actual Inside Dia. 3.8 in, Actual Width 0.139 in, Dash Number 241, Color Black, Durometer 90 Shore A, Nominal Outside Dia. 4 1/8 in, Actual Outside Dia. 4.137 in, Temp. Range -55 to 300 Degrees F, FDA Approved No, Properties Resistant to Chemicals, Resistant to Oils, Resistant to Water