The DuraStone is an original BFE pattern and is the newest addition to the fly database.  This fly has been proving itself by catching fish after fish and still being able to pass as a stonefly while other patterns are beat to a pulp!  The DuraStone is a versatile stonefly pattern at the vice too.  The original is tied on a scud hook to imitate a tumbling nymph that has been dislodged from the river bottom.  The size of scud hooks are limited, but for a larger fly the DuraStone is tied on a TMC 200 or equivalent to imitate the larger bugs.  By changing the colors of materials it is possible to tie a fly that represents any type of stones on the water you fish.  You can also adjust the amount of weight to suit your preferences and needs.  Give the DuraStone a go when the big bugs are hatching or as an anchor anytime of year and hold on tight!