Incredibly easy to install. At first glance I thought they were a little lightweight. And sure enough once I tightened the wheels on, they cracked. They are indeed metal, but I believe they are aluminum, and pretty thin. Did I over overtighten? Maybe, but I had changed the rear driveshafts to steel already and kinda needed to make sure they were pretty snug. Fact is the stock ones are much much more heavy duty.
Installed these on a arrma senton. So I can have more 12mm wheel options instead of being limited to the more rare 14mm. Day after I installed them I did a gnarly 3 battery bash session with easy 20 foot drops. And they performed with out a hiccup. Just make sure the hex is seated all the way befor tightening the set screw if not the hex will slide off.