True 5:1 concentration. 1  Double the strength of other brands. 2  Minimal or no fillers and binders. 3  No pharmaceuticals, sugar, or dyes. 4  Comprehensive lab testing (e.g., heavy metals,etc.) 5  Made in a cGMP certified facility. 6  Unbeatable value. 7  Safely used in the USA since 1995.
Arrow Length - refers to the length of the arrow shaft. Arrow size - refers to the spine (stiffness) of the arrow. The shaft size is always referring to the diameter of the shaft, the wall thickness of the shaft and the distance that the arrow shaft will flex before it bends or breaks.
The weight of an arrow shaft can be expressed in GPI (Grains Per Inch). The length of a shaft in inches multiplied by its GPI rating gives the weight of the shaft in grains. For example, a shaft that is 30 inches long and has a GPI of 9.5 weighs 285 grains, or about 18 grams.