Material: 100% Pure Carbon Straightness: +/-0.003 Length: 32" Spine: 300-450 (10 spine increments) Diameter: 0.244" (inner), 0.299" to 0.281" (outer) GPI: 5.98 to 9.06 grains About this item: Dragon 9 Carbon Hunting Arrows are precision-crafted from 24T pure carbon for durability. They feature removable tips, anti-explode pin nocks, and colored TPU vanes. Suitable for compound bows up to 75 lbs draw weight