An EI Curve measures a shafta (TM)s stiffness at multiple points from the handle to the tip, showing how it bends under load. For Project X Titan Black, the more elastic handle section allows players to feel the shaft load smoothly during the ransition, while the progressively stier mid and tip sections stabilize the club through impact producing a low lauch and low spin profile. Features: Newest Profile from Project X: Designed and engineered in our R&D Lab in San Diego, CA to meet the demands of todaya (TM)s faster, more aggressive swings Advanced EI Curve Design: Features a more elastic handle that progressively firms through the mid and tip sections, delivering a smooth feel with added stability Synex Technology: Multi-axial carbon fiber matrix reinforces the shafta (TM)s outer structure, increasing hoop stiffness from handle to mid section for maximum energy transfer Confidence to be Faster: The unique profile blends feel and control, giving players the freedom to swing aggressively without sacrificing dispersion or consistency