Carbon Express Tank 25 Shafts 1 doz.. 400? spine with the durability 360 degree spine consistency and the superior accuracy of the Tank series. .400" spine (0.349" ID / 0.382" OD). Straightness factor: .0025". Weight: 7.1 gpi. Specifications for Carbon Express Tank 25 Shafts: Manufacturer: Carbon Express Color: Orange Black Quantity: 10 Spine: 400 Size: 400 Features of Carbon Express Tank 25 Shafts: 360 degree spine consistency Superior accuracy 0.349" ID / 0.382" OD Package Contents: Carbon Express Tank 25 Shafts Carbon Express Tank 25 Shafts