SPECIFICATIONSMicro-Diameter 100% ACU-Carbon fiber construction, hunting arrow- increased velocityReduced friction in flight and at impact to offer optimized FOC, enhance target penetration, and better accuracy at long range4 popular hunting spine sizes- 250, 300, 340, and 400Includes NEW 4mm Aluminum Match Grade Half-outs (55 grains) for optimum hunting FOC4MM Microlite nocks pre-installedCompatible with standard thread 8-32 broadheads and field pointsMade in USAStraightness: +/- .001?6 pack boxes come in 32? stock length only. Easton 4mm Axis LR Match Grade 300 Arrow w/3" Hybrid 26 Vanes & 55gr Half-Outs 6pk 101382