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 1/2 in Nominal Width 1/4 in Actual Inside Dia 10.475 in Actual Width 0.275 in Dash Number 450 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 EPDM 70 Nominal Outside Dia 11 in Actual Outside Dia 11.025 in FDA Approved No Package Quantity 2