Micro-diameter arrow for ultimate accuracy with minimal wind drift. Designed with strict tolerances that make it ideal for field and outdoor target archery. Straightness Tolerance: +-.001â?쳌, Weight Tolerance: +-.5 gr. Available in sizes 250 (9.9 GPI), 300 (9.1 GPI), 340 (8.3 GPI), 400 (7.6 GPI), 500 (6.6 GPI), 600 (6.2 GPI), and 700 (5.5 GPI). Components sold separately.