The Maxima Photon SD is the fastest arrow in the Carbon Express lineup. The .203 inch inside diameter, 18-grain aluminum half-out insert and lightweight carbon design ensures premier speed, less drop, more penetration and less wind drift. When paired with patented Tri-Spine Technology, this exclusive blend of materials and construction generates up to 4X the accuracy of traditionally constructed single spine arrows. The Maxima Photon SD Arrows combine stiffer ends with a softer spine center, plus 30-ton carbon construction for faster recovery and premier downrange accuracy. To further enhance arrow-to-arrow consistency, each shaft is laser checked for straightness to a remarkable 1/10,000 (.0001) of an inch! .203 inch inside diameter 18-gr. aluminum half-out insert 30-ton carbon fiber construction Aircraft-grade 7074 aluminum premium half-out insert system Comes with a standard threaded 21-grain insert BullDog nock collars for strength Launchpad precision nocks for controlled arrow release Tri-Spine/Red Zone technology controls oscillation Spine sorting tolerance: +/- .002" Weight sorting tolerance: +/- 1.0 grains Fletched with Q2i Rapt-X vanes Available in .350 and .400 Compatible with Nockturnal FIT Universal Nocks and 17/64 inch diameter practice points Order today!