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 7 1/4 in Nominal Width 3/16 in Actual Inside Dia 7.225 in Actual Width 0.21 in Dash Number 366 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 7 5/8 in Actual Outside Dia 7.645 in Temp Range -40 Degrees to 250 Degrees F FDA Approved No Package Quantity 5