'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, Actual Inside Dia. 0.414 In., Actual Width 0.072 In., Dash Number 905, Color Black, Durometer 90 Shore A, Meets/Exceeds SAE J200, ASTM D2000, Nominal Outside Dia. 5/16 In., Actual Outside Dia. 0.558 In., Temp. Range -15 Degrees to 400 Degrees F, Package Quantity 25'