Lynx / Oxy offer spare bag for OXY 4 Heli Kit
1 x OXY4 - 24T Tail Pulley
STD Tail Ratio = 3.66
For more information about the usage of this specific tail pulley, read user manual Head Speed and Tail Ratio suggestions.
NOTE: This spare is compatible for any OXY 4 - OXY 4 Max