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 7/8 in Nominal Width 1/8 in Actual Inside Dia 5.859 in Actual Width 0.139 in Dash Number 257 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 EPDM 70 Nominal Outside Dia 6 1/8 in Actual Outside Dia 6.137 in FDA Approved No Package Quantity 10