O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Buna N Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 11 1/2 in Nominal Width 1/4 in Actual Inside Dia 11.475 in Actual Width 0.275 in Dash Number 452 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 12 in Actual Outside Dia 12.025 in Temp Range -40 Degrees to 250 Degrees F FDA Approved No Package Quantity 2