Don't know about the hardness specifically, but my son and I used blues last week for a whole meeting of 4 rounds plus the final. I reckon they should be good for at least a couple more heats next time too. Not quite as much grip as yellows, but more consistent through the day as you don't go in to your second or third run wondering when they will go off completely. Not sure how they will cope when it not so hot and sunny though.
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