Carbon Express Maxima Hunter Contour Carbon Spine Crossbow Bolt - 3 Pack - The Maxima Mossy Oak Contour crossbolt provides Dual Spine Weight Forward technology that fuses different carbon materials to create two spines in one crossbolt. This technology combined with our patented BuffTuff and Carbon Weave delivers twice the accuracy, strength, and durability unmatched in other crossbolts. Dual Spine Weight Forward Two Spines In 1 Arrow. This Patented Fusion Of Two Different Carbon Materials Makes For Better Energy Management And Faster Recovery. Bolts Spin 20% Sooner, Retain More Speed, And Deliver Unparalleled Accuracy Bufftuff Plus Precision Design With Patented Bufftuff Plus Carbon Weave For Superior Strength And Accuracy Real Straightness Precision Sorted For Straightness To +/- 0.002in, For Repeat Maximum Consistency (Maximum Measurement, Not An Average) 3-pack Crossbolts Includes Inserted Moon Nocks, Plus 3 C-Nocks And 3 Universal Nocks. Field Points Sold Separately Outside Diameter: 0.343in Inside Diameter: 0.284in Straightness Factor: ±.002in