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 1 1/2 in Nominal Width 3/16 in Actual Inside Dia 1.475 in Actual Width 0.21 in Dash Number 325 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 1 7/8 in Actual Outside Dia 1.895 in Temp Range -40 Degrees to 250 Degrees F FDA Approved No