O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Viton Durometer (Hardness) Rating Very Hard Nominal Inside Dia 9 in Nominal Width 3/16 in Actual Inside Dia 8.975 in Actual Width 0.21 in Dash Number 373 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 FKM 90 Nominal Outside Dia 9 3/8 in Actual Outside Dia 9.395 in FDA Approved No Package Quantity 2