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The Skytec Delrin gears are the only truly CNC milled aftermarket gears for 340mm class helis (rotor diameter).
Delrin is a thermoplastic polymer that is several times stronger than the stock plastic. It has self lubricating qualities.
The Skytec gears are also slightly thicker than stock plastic gears.
The gear is sold WITHOUT the suitable bearing (2x6x3mm). The bearing SK-7012-692 can be purchased separately