Carbonex The Round-Shape Head With Box-Shape Frame Cross Section Gives Carbonex A Unique And Solid Feeling. For Players Who Seek A Solid Feel From The Strings At Impact. At Impact Elastic Ti Resists Deformation Stretching Then Recovering Its Shape Quickly To Launch Accurate Shots With The Full Energy Of The Swing. Box Frame Realizes A Solid Feel At Impact. Built-In T Joint Moulded Deep Into The Layers Of Graphite Where The Frame Connects With The Shaft The Yonex Built-In T-Joint Creates A Durable And High-Strength One-Piece Frame That Is Torque-Free.