Micro-diameter arrow for ultimate accuracy and penetration with minimal wind drift. The Pierce uses components that maximize concentricity and durability. Straightness Tolerance: +-.006â€, Weight Tolerance: +-2.0 gr. Available in sizes 250 (9.8 GPI), 300 (9.1 GPI), 340 (8.3 GPI), 400 (7.6 GPI), and 500 (6.6 GPI). Includes GTO nocks and Ballistic insert system. Factory fletched with 2†Q2i Fusion X vanes.