2MM carbon metal frame overall structure, anchor using 's bearing design, standard. Level sight glass, easy to adjust the balance of the main rotor. In addition, equipped with a magnetic balancer, it can be more accurate detection of the static and dynamic balance of the main rotor. Full use of carbon fiber and aluminum CNC machining, apply to all main rotor mounting holes for 2-5MM diameter all main rotor colour: red + black + orange Material: metal Package Contents: 1 x paddle balancer set Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.