it depends which black ones you have
gen 1 were replaced foc by losi because they shattered big style
gen 2 were near impossible to break but after a few meetings needed changing because the hingepin hole stretched big enough to fit your finger in (ok a bit of an exageration but you get the point).
gen3 white in colour - half way between the 2 will break with a big enough impact but lasts much longer before needing to be replaced due to slop
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