O-Ring, No Metal Detectable, No X-Ray Detectable, System of Measurement Inch, Cross Section Shape Round, O-Ring Material Viton, Durometer (Hardness) Rating Very Hard, Nominal Inside Dia. 19 in, Nominal Width 3/16 in, Actual Inside Dia. 18.955 in, Actual Width 0.21 in, Dash Number 388, Color Black, Durometer 90 Shore A, Meets/Exceeds ASTM D2000, SAE J200, Nominal Outside Dia. 19 3/8 in, Actual Outside Dia. 19.375 in, Temp. Range -15 Degrees to 400 Degrees F, FDA Approved No