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●Use for T-REX 600N/600E/550 ●Utilizes newly developed, highest spec and superior anti-wear material to increase the overall strength and durability for torque tube drive gear. Effectively minimize gear striping and crash damage. ●Must with Autorotation Tail Drive Gear set(H60020AA)	●600 Front drive gear assembly x 1 ●600 Long umbrella gear x 1 ●600 Short umbrella gear x 1