O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Buna N Durometer (Hardness) Rating Very Hard Nominal Inside Dia 6 1/4 in Nominal Width 3/32 in Actual Inside Dia 6.237 in Actual Width 0.103 in Dash Number 164 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 NBR 90 Nominal Outside Dia 6 7/16 in Actual Outside Dia 6.443 in FDA Approved No Package Quantity 2