This is a replacement XLPower 13T Helical Pinion Gear, suited for use with the XLPower 520 & 550 helicopters.Diameter: 15.5mmHeight: 16mmWill fit 5mm or 6mm shaft (sleeve included).
Protos 380/420 Metal tail grip (2.6mm) : MSH41176-2Fit for Protos 380/420. New counterweight design for better tail performance.Fit for Rotortech 71mm carbon tail blades