Description The Altra Arrows 166 Phantom Premier Arrows are precision-built micro-diameter arrows designed for reduced wind drift and consistent performance. Featuring an industry-leading .001" straightness verified by advanced measurement technology, NO SPINE Technology for improved tunability, and an advanced lightweight carbon layup for speed and durability, these arrows are built for serious bowhunters who demand accuracy. Premium aluminum, titanium, and stainless steel components enhance overall performance, while each package is weight-matched to +/- 1 grain for dependable consistency. Available in multiple pack options, the 166 Phantom Premier Arrows include the Phantom A.R.C.O.S. Insert/Outsert System and nocks for a complete high-performance arrow setup. Specs Grains Per Inch 250 - 9.8300 - 8.5340 - 8.0400 - 7.1 Factory Length 32" Components Included Phantom A.R.C.O.S. Insert/Outsert system and nocks Manufacturer Warranty Limited