FeraDyne D-Stroyer SD 350 Spine Carbon Arrows - 6 Pack - Further enhancing a reputation for delivering the world's most accurate Dual Spine Arrows Carbon Express has once again broken the mold with the introduction of the D-Stroyer hunting arrow. With four distinct options to choose from the new D-Stroyer line from Carbon Express maximizes the performance of exclusive Dual Spine Weight Forward technology to deliver twice the accuracy and unprecedented performance when compared to traditional single spine arrow construction. The patented 2 Spine arrow shaft that reduces oscillation by 50% vs single spine and has twice the accuracy. Dual Spine Weight Forward Launchpad Precision Knocks Match Weight +/- 1 Grain Free Arrow Cutting In Store With Purcahse!