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 1 1/2 in Nominal Width 3/16 in Actual Inside Dia 1.4 in Actual Width 0.21 in Dash Number 325 Color Black Durometer 90 Shore A Nominal Outside Dia 1 7/8 in Actual Outside Dia 1.895 in Temp Range -55 to 300 Degrees F FDA Approved No Properties Resistant to Chemicals Resistant to Oils Resistant to Water