From hunting, to 3D tournaments, to recreational target shooting, Easton Archery???s Axis Arrow Shafts reign supreme. They utilize a 4mm diameter micro profile, a proven concept that focuses the arrow???s kinetic energy into an ultra-small frontal area which reduces friction behind the broadhead channel and causes deeper penetration. The small diameter also provides better flight in crosswinds when compared to regular carbon arrows, so the broadhead will find the point-of-aim more often in the field. In addition, the 4mm Axis arrow shafts offer 24% more kinetic energy density than standard diameter carbon arrows for greater stopping penetration ??? a good choice for larger game. Features: Micro profile: focuses kinetic energy into ultra-small frontal area for reduced friction and deeper penetration Better flight in crosswinds 24% more kinetic energy density than standard diameter carbon arrows for greater stopping penetration Easton Axis 4mm Size 400 Long Range Shafts 12pk 530113