O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material EPDM Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3 3/4 in Nominal Width 3/32 in Actual Inside Dia 3.737 in Actual Width 0.103 in Dash Number 154 Color Black Durometer 70 Shore A Meets/Exceeds ASTM D2000 SAE J200 Nominal Outside Dia 3 15/16 in Actual Outside Dia 3.943 in Temp Range -65 Degrees to 300 Degrees F FDA Approved No