The entire top end is X-Cell.

The main shaft and swashplate and everything above it is X-Cell. I'm running the white 3D paddles on an X-Cell flybar. It has the large fuel tank, the metal pitch arm and elevator rocker arm, HHI tuff Struts skids, One peice tail rotor hub, Ricks split gear driven tail, metal frame inserts and carbon frame brace. I'm running 4131's and a GY 401/9253 combo, SAB 600, OS 50 with Weston 46 pipe.