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 3/8 in Nominal Width 1/16 in Actual Inside Dia 0.3 in Actual Width 0.07 in Dash Number 012 Color Black Durometer 90 Shore A Nominal Outside Dia 1/2 in Actual Outside Dia 0.504 in Temp Range -55 to 300 Degrees F FDA Approved No Properties Resistant to Chemicals Resistant to Oils Resistant to Water