S500 HMF S550 Replacement Frame Arm

Description:
 
This item is the replacement arms for S500 and HMF S550 multicopter quadcopter. Also you can buy this arm to DIY your own multi-copter.
Merit:
Strong and hard motor arms material (with built-in fiber glass tube)
Design with Dihedral angle, more stable, good for FPV
Light weight arms compare with DJI or HJ 450 frame

Carbon rod inside the Arms which used to make it stronger and hard