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This is a replacement set of 0.5mm module pinion gears for the Align 450 line of helicopters using motors with 3.17mm output shafts. This series of pinions work best with motors in the 3550kV range using 3s battery packs or can be used with the  3700 and 4050kV motors to get very high head speeds.

Package includes:

• (1) 11Tx3.17mm pinion
• (1) 13Tx3.17mm pinion
• (1) 15Tx3.17mm pinion
• (3) 3x3mm set screws