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 3/4 in Nominal Width 1/16 in Actual Inside Dia 0.7 in Actual Width 0.07 in Dash Number 018 Color Green Durometer 70 Shore A Nominal Outside Dia 7/8 in Actual Outside Dia 0.879 in Temp Range -55 to 300 Degrees F FDA Approved No