Easton 5mm Axis Sport 300 Spine Carbon Arrows - 6 Pack - New high penetration 5mm axis sport (SPT) carbon arrows for shorter drawithlower poundage bows.. 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 SPT is priced to offer exceptional value. The 5mm micro diameter Axis SPT hunting arrows are compatible with all Axis accessory components, including the highly demanded FOC enhancing Easton brass inserts, and now it's more affordable than ever. 5mm Aluminum 8-32 half-out included (25 grains) Pre-installed 5mm X Nocks 5mm small-diameter uniform ACU-CARBON Straightness: .005in High-strength carbon-composite fibers