O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Polyurethane Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3/16 in Nominal Width 1/16 in Actual Inside Dia 0.1 in Actual Width 0.07 in Dash Number 008 Color Natural Durometer 70 Shore A Nominal Outside Dia 5/16 in Actual Outside Dia 0.316 in Temp Range -20 Degrees to 180 Degrees F FDA Approved No Properties Resistant to Oils Resistant to Weather