O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Viton Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 1/2 in Nominal Width 3/16 in Actual Inside Dia 0.475 in Actual Width 0.21 in Dash Number 310 Color Black Durometer 75 Shore A Meets/Exceeds ASTM D2000 FKM 75 Nominal Outside Dia 7/8 in Actual Outside Dia 0.895 in FDA Approved No Package Quantity 10