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 4 in Nominal Width 1/16 in Actual Inside Dia 3.989 in Actual Width 0.07 in Dash Number 045 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 NBR 90 Nominal Outside Dia 4 1/8 in Actual Outside Dia 4.129 in FDA Approved No Package Quantity 10