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 5/8 in Nominal Width 3/32 in Actual Inside Dia 1.612 in Actual Width 0.103 in Dash Number 130 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 NBR 90 Nominal Outside Dia 1 13/16 in Actual Outside Dia 1.818 in FDA Approved No Package Quantity 25