Reduced diameter shaft designed for durability and accuracy in wind and other inclement weather. Straightness tolerance of +-.006â?쳌 and weight tolerance of +- 2 grains. Available in sizes 500 (7.6 GPI), 400 (9.5 GPI), 340 (9.9 GPI), 300 (10.4 GPI) and 200 (11.6 GPI). Includes Accu-Tough inserts and nocks.