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 14 1/2 in Nominal Width 1/4 in Actual Inside Dia 14.475 in Actual Width 0.275 in Dash Number 458 Color Black Durometer 90 Shore A Meets/Exceeds ASTM D2000 NBR 90 Nominal Outside Dia 15 in Actual Outside Dia 15.025 in FDA Approved No