Killer Instinct 400 spine Carbon Arrow - 3 Pack - The all-new Intense Series of arrows from Killer Instinct features the quality and performance bowhunters demand. The Intense series utilizes a unique 100% carbon construction that produces exceptional spine consistency. Each shaft is Laser sorted and matched for straightness. Precision sorted for straightness to +/- 0.005” for maximum consistency. Pre-cut length fletched with 2” vanes, 0.244” Inner Diameter, 3 per pack, tunable nocks. STRAIGHTNESS TOLERANCE - .005” INNER DIAMETER - .244” 400 SPINE - 29" - 256 gr