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 1 9/16 in Nominal Width 3/32 in Actual Inside Dia 1.549 in Actual Width 0.103 in Dash Number 129 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 NBR 90 Nominal Outside Dia 1 3/4 in Actual Outside Dia 1.755 in FDA Approved No Package Quantity 25