Pure carbon arrows in a lightweight, high F.O.C. design. 300 spine, 2.75” 4 fletch vanes, .299” outer diameter, .001” straightness, 8.8 GPI, .246” inner diameter.Features:.246 Inside diameter; /- .5 grain weight tolerance; /- .001" straightness tolerance;Multiple laser full-shaft straightness sorting;Includes brass and aluminum inserts