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Mine are all solid. 70 duro. I did get a 4" in 40 duro , 8" in 60 duro. I haven't used too much pressure on the softer ones but they do flatten out some. Can be handy for certain grinds. There is...

I haven't got into the longevity part yet but love the blaze belts for the way they stand up to water. Thanks for the tips on belts Max.
Also heard angels singing when I first used a belt cleaner...

+1 on what Maximilian says. Take note : the bigger the wheel, the closer to wedge the grind will be. Double hallows use two sizes close to the same, like 4" and 6". So it all depends on what you want...