O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material HNBR Durometer (Hardness) Rating Hard Nominal Inside Dia 3 3/4 in Nominal Width 3/32 in Actual Inside Dia 3.7 in Actual Width 0.103 in Dash Number 154 Color Black Durometer 90 Shore A Nominal Outside Dia 3 15/16 in Actual Outside Dia 3.943 in Temp Range -55 to 300 Degrees F FDA Approved No