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2 grains per inch and straightness tolerance is an impressive plus/minus .
Currently I'm shooting 27-inch Carbon Express Terminator Hunter arrows weighing 12 grains per inch (gpi).
ARROW SIZE GRAINS PER INCH Beman ICS 300,340,400,500 8.
There are a few important attributes to consider when choosing your arrows; spine and spine consistency, grains per inch (gpi), straightness and weight tolerances.
Game Tracker has three of the most interesting design innovations in carbon: knurled inserts that stay in place; 70 and 100-grain screw-in target points that are slightly larger than the shaft, aiding target extraction; and weight tubes that allow the addition of 2 or 3 grains per inch to your shaft, which raises kinetic energy.
1 grains per inch (gpi) in the lightest 500 deflection to 10.
The shaft spec button gives you the size, type (aluminum, carbon, combination), maximum length, outside diameter, grains per inch, wall thickness, inside diameter and spine.
5 grains per inch in shafts spined for standard hunting weights.