For players seeking incredible speed and accuracy across the entire face. A deeper, lower CG pairs with the new Active Recoil Channel 4.0 to produce a consistently higher, faster launch. The adjustability features of TSi have been engineered to deliver maximum benefit for every player. We continue to refine the ways in which a fitter can fine tune performance to ensure you get the most out of every swing. A lighter, more refined ARC 4.0 perfectly aligns CG placement to deliver greater face flexibility and faster balls speeds, especially low on the face. An ultra-thin crown and variable face thickness combine to drive the CG low for higher launch and lower spin, creating a powerful combination of speed and stability.