Reduced diameter carbon shafted designed to have superior long distance performance. Great hunting shaft for any big game species. Straightness tolerance of .001 or better and weight tolerance of +- 1 gr. Available in sizes 250 (10.7 GPI), 300 (8.7 GPI), 350 (8.2 GPI), and 400 (7.0 GPI). Nocks and steel half-out inserts included.