Carbon Express Predator AIR 5mm Arrows Shafts 300 Spine 12 Pieces Black. The 5mm shaft diameter supports efficient flight and reliable penetration while 360-degree spine consistency helps maintain predictable shaft behavior for straightforward repeatable tuning. Straightness is held to +/- 0.025 inch max with an average straightness of +/- 0.002 inch and weight tolerance is +/- 2.0 grains. Components: 5mm aluminum sleeved two-piece 40-grain inserts. Specifications for Carbon Express Predator AIR 5mm Arrows Shafts: Manufacturer: Carbon Express Color: Black Fabric/Material: Carbon Quantity: 12 Diameter: 5 mm Features of Carbon Express Predator AIR 5mm Shafts: 5mm diameter shaft 360-degree spine consistency Straightness:+/-0.025 inch max Average straightness:+/-0.002 inch Weight tolerance:+/-2.0 grains Components 5mm aluminum sleeved two-piece 40-grain inserts Available in 300 350 400 Package Contents: Carbon Express Predator AIR 5mm Arrows Shafts Carbon Express CX05785: Predator AIR 5mm Arrows Shafts 300 Spine 12 Pieces Black