Easton X7 Eclipse 2014 spine Aluminum Shafts - 12 Pack - X7 Eclipse arrow shaft is the World Standard for precision and a perfect tune. Precise spine, consistent weight and incredible straightness. 7178-T9 Aerospace Alloy Aluminum Hard-anodized black finish Straightness: ± .001in Weight tolerance: ± 0.75 percent Strength (psi): 105,000 G-UNI/Super UNI bushing installed Nocks and points sold separately Sizes 1514 through 2214 are World Archery compliant MADE IN USA