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 5mm Axis Match Grade 340 Arrow w/3'' Hybrid 26 HIT & Collar 6pk 801388