The Dan McCarthy PS23 Premium Signature series shaft was developed personally by Dan, a multi-time IBO & ASA champion. No expense was spared when developing the tightest tolerance shafts available specifically for the highest levels of competition. Arrow Shaft Includes: All components are sold separately, allowing you to customize to fit your needs. Specifications: Straightness or Straighter: (.001) Grain Weight Tolerance: +/-1 Shaft Length: 32 Spine: 400 Inner Diameter: (.315) Outer Diameter: (.353) GPI: 7.3