Carbon Express D-Stroyer. With three 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 50percent vs single spine and has TWICE THE ACCURACY Specifications for Carbon Express D-Stroyer: Manufacturer: Carbon Express Quantity: 1 Condition: New Additional Features: No Package Contents: Carbon Express D-Stroyer