Carbon Express D-StroyerFeatures:Dual Spine Weight Forward Technology Patented 2 spine arrow shaft with heavier front for tighter groups & better penetration plus reduces oscillation by 50% &TWICEthe ACCURACY. K-360 Patented outer layer construction on the front 2/3 that integrates 100% high modulus carbon weave for consistent spine strength and durability.Laser Match Set Pack sets are sorted & matched by spine and weight for best-in-class consistency. Spine sorting tolerance +/- .0025 & Weight sorting tolerance +/- 1.0 grains+/- .003 Real Straightness Laser checked for straightness to remarkable 1/10,000 of an inch, our straightness standards are set as a max not an average like competitors. Launchpad Precision Nocks Controlled arrow release and integrated shaft alignment for more consistent accuracy.Q2i Rapt-X 2 VanesOne Arrow, Two Spines for Twice the Accuracy and DurabilityThe D-Stroyer is a performance hunting arrow engineered with patented Dual Spine Weight Forward technology. It features K360 carbon weave on the outer construction on the front 2/3 for consistent spine strength and durability. Dual Spine Weight Forward technologydelivers a heavier front for tighter groups & better penetration but also has twice the accuracy and unprecedented performance when compared to traditional single spine arrow construction. The patented Dual Spine Weight Forward arrow shaft that reduces oscillation by 50% vs single spine and has TWICE THE ACCURACY as its by far the most accurate arrow for the money!