Note : This main gear for BLADE 230S V2 isthicker 1.1mm than the main gear for BLADE 230S. The Titanium Main Shaft/CNC Delrin Main Gear/Auto-Rotation Hub set is specifically designed with Solid Titanium One-way Main Shaft, Adjustable Colar and Auto-Rotation Hub to optimize for stability, durability and overall performance of the BLADE 230S / V2 / Smart / REVOLUTION 235 CP helicopter.