O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Aflas Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 5/16 in Nominal Width 3/32 in Actual Inside Dia 0.2 in Actual Width 0.103 in Dash Number 109 Color Black Durometer 80 Shore A Nominal Outside Dia 1/2 in Actual Outside Dia 0.505 in Temp Range 30 Degrees to 450 Degrees F FDA Approved No