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 5/16 in Nominal Width 3/16 in Actual Inside Dia 1.2 in Actual Width 0.21 in Dash Number 323 Color Black Durometer 90 Shore A Nominal Outside Dia 1 11/16 in Actual Outside Dia 1.707 in Temp Range -55 to 300 Degrees F FDA Approved No