Easton 5mm Axis Sport 400 spine Carbon Shafts - 12 pack - Easton’s Axis Sport (SPT) is the newest member of the legendary AXIS lineup offering improved field performance for bowhunters with shorter draws and/or lighter-poundage setups. The 5mm micro diameter Axis SPT hunting arrows are compatible with all Axis accessory components, including the highly demanded FOC enhancing Easton brass inserts. Easton's 5mm Halfout Straightness: .006in Pre-installed X Nock High strength carbon-composite fibers