O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Viton Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 2 5/8 in Nominal Width 1/8 in Actual Inside Dia 2.609 in Actual Width 0.139 in Dash Number 231 Color Black Durometer 75 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 2 7/8 in Actual Outside Dia 2.887 in Temp Range -15 Degrees to 400 Degrees F FDA Approved No Package Quantity 10