.224'' (5.7 mm) Buna-N O-Ring Cord Stock, 70A Durometer, 0.224" Thickness, 10' Piece, Black O-Ring Cord made of Buna-N (Nitrile, NBR) for use with a variety of fluids and hydrocarbons Durometer (hardness) of 70A For use across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C) Made in the U.S.A. Available in various cross sections and lengths