Easton Hyperspeed Pro 400 spine Carbon Arrows - 6 Pack - Easton’s Hyperspeed Pro 3D arrows are all-around performers for compound target and 3D shooting. These 6.5MM 3D carbon arrows combine speed performance, with the unmatched precision and durability of Easton’s Made in USA Carbon technology. The Hyperspeed Pro is available in the most popular performance spines ranging from 300 to 500. Features Standard diameter penetration. Carbon fiber durability. 6.5MM standard-diameter high-strength carbon fibers Pre-installed 6.5 MM Microlite Super nocks CB RPS 8-32 inserts Straightness:±.001in