The heaviest of Carbon Express arrows, the PileDriver Hunter DS Arrows create maximum kinetic energy for greater knockdown power. Dual Spine Weight Forward technology incorporates two spines to deliver more speed, better accuracy and deeper penetration than a single-spine shaft. Mossy Oak Break-Up BuffTuff offers extreme durability and a quiet draw. Arrows are full length. Inserts and nocks included. Per 6. Straightness factor: /.0035. Wt. tolerance: 1 gr. Recommended field-point size:19/64. Sizes: 250, 350. Size GPI Length Spine Dia. 250 10.5 32.5 0.402 0.304 350 11.4 32.5 0.345 0.308