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CopterX CX450 Aluminum Alloy 3D Rotor Head Upgrade Conversion Set Features - Main Rotor The ultimate 450 size helicopter rotor system! Direct fit for all Trex 450 compatible helicopters Special design for ultra quick and precious response +/-15° degree pitch range for extreme 3D maneuvers CNC by the highest aircraft grade aluminum alloy available Fully ball raced and trusted bearing for slop free and long service life during the most extreme conditions 240° reinforced alloy swash system with high grade bearing One piece alloy washout base (not copper busing) to minimize slop for quick and true response New designed control arms system for slop-free positive control Over size 4mm feathering shaft, bearings, trust bearing system for maximum loading and long service life during the hardest flight condition possible Enclosed trust bearing system for smooth and long lasting operation Hardened steel main shaft Control arms features special collar system to prevent bearings from blinding Features - Tail Rotor System Direct fit for all Trex 450 compatible helicopters CNC by highest aircraft grade aluminum alloy available Aluminum alloy drive pulley with ball raced belt tensioner for positive rudder control Low fraction driver belt for minimum power lost Open design for easy maintenance Hardened alloy slider for long and smooth service life Hardened steel rotor hub use lock nut system for the tail blade grips for safe and quick maintenance Control arms features special collar system to prevent bearings from blinding