As per Joe, from Joker-USA, I shouldn't have received the plastic tail blades. 

I received the carbon fiber ones after.

It helps to line up the parts before assembly.

Don't forget loctite.

CRASH NOTES

In a tail-in crash always check every component.  Of course the tail blades will break.  I always disassemble the tail grips.  I've found the bearings inside totally destroyed after a crash.  Make sure the tail-rotor hub is straight.