Lamentably there's no description for this item. I realised that THE JOINT IS MADE OF PLASTIC when I received them, but the shafts are made of metal.
Not happy with this...
I can't say if they will hold up with a brushless system, because I'm installing them now in my buggy.
Will have to loosen up the slipper clutch a lot to start testing and not brake them right away.
My motor is a Novak Velocity 5.5R, that's why I'm worried.