6 Sets RC Helicopter Training Kit 300-450 Helicopter
The material of the center hub was improved. It is now much stronger than the previous version. Someone said that is it a must item for new RC helicopter handlers but why? This diagram tell you the answer
It saves a lot of repair time and cost. Trust me, if you don't have much experience in handling rc helicopter, buy it. It will be the one of the best investment for this hobby.
6 sets x Helicopter training kit