Overall: MTB components need to be fairly robust. These levers aren't. I slipped on a rock whilst getting back on the bike during a 100km enduro and the bike fell, without my weight on it, and snapped a lever on a rock. Game over. On examination of the snapped end, it looks like the very light, brittle, almost ceramic-looking white metal alloys that some novelty toys used to be made of. Go for something a bit more solid unless you're confident about never falling off.