Penley graphite shafts are designed and manufactured in San Diego/CA, USA. Penley shafts are researched and developed by Carter Penley. Penley shafts feature proprietary TBAR (Tip to Butt Aspect Ratio) algorithm and ZONE FLEX Characterization. Penley is the only â€œoff the shelfâ€ Tour quality shaft in the industry. When you buy a Penley shaft, you are buying a true Tour shaft with Tour demanded performance! Itâ€˜s the exact same shaft Penley supplies to Tour players and Long Drivers.