O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material EPDM Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 5 1/8 in Nominal Width 1/8 in Actual Inside Dia 5.109 in Actual Width 0.139 in Dash Number 251 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 5 3/8 in Actual Outside Dia 5.387 in Temp Range -65 Degrees to 300 Degrees F FDA Approved No Package Quantity 10