O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material HNBR Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 1 5/8 in Nominal Width 3/16 in Actual Inside Dia 1.6 in Actual Width 0.21 in Dash Number 326 Color Black Durometer 80 Shore A Nominal Outside Dia 2 in Actual Outside Dia 2.02 in Temp Range -55 to 300 Degrees F FDA Approved No