Richard, the "H" part have a higher fibre content and are brittle as glass straight out of liquid nitrogen .... last year I was forced to use on and it got broken by the guy putting my car on the grid for a final, he dropped it and it landed upside down from about 9" .... you could say they are smashing!
Even the guys running in the hot states in the US prefer not to use them so I'm told.
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