OMPHOBBY M4 Helicopter Tail Pulley 22t(Black)OSHM4037B Sale! from 811 /per Qty. Add to Cart This is a replacement tail pully flange set for the OMPHOBBY M4 Helicopters Contents Tail Pulley 22t-1Driver Pin Φ2*9.5-1 Qty available:1 SKU:OSHM4037B