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 10 in Nominal Width 1/4 in Actual Inside Dia 9.975 in Actual Width 0.275 in Dash Number 449 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 EPDM 70 Nominal Outside Dia 10 1/2 in Actual Outside Dia 10.525 in FDA Approved No Package Quantity 2