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 Medium Hard Nominal Inside Dia 2 1/8 in Nominal Width 3/32 in Actual Inside Dia 2.112 in Actual Width 0.103 in Dash Number 138 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 NBR 70 Nominal Outside Dia 2 5/16 in Actual Outside Dia 2.318 in FDA Approved No Package Quantity 10