The front plastic Hex work. They just like to stick in the rim when You take the rim off. I have installed a small set screw on my SC10RS front hex to stop them from doing that. You can also run the TC5 front alum. hex on the B4.1. For the rear I would run the Jconcpets rear hex. They look nicer and won't come off when you remove the rim.

I run Hex in the rear and Inline front axles in the front keeping the bearings in the rims