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Features: Full CNC heavy duty aluminum alloy construction Full ball raced for smooth and long lasting operation Oversized 3mm feathering screw design Fully compatible with most popular 450size helicopter with 5mm main shaft For best performance, we recommand to use these multi blades rotor head with CopterX composite main blades (CX450BA-20-03, CX450BA-20-04, CX450BA-20-05)