Arrows should not magically gain mass nor change material!

Do a Google Images search for "bow hunting arrow weight chart" and you'll see that arrows are measured in grains, not pounds.  A very heavy arrow (for a bow with a very heavy draw!) should be at most 1000 grains (or 0.14 lbs).

Under no circumstances should an arrow weigh more than the sum of its parts!!   (A sharpened arrow may even weigh slightly less, as you've shaved material off of the arrow shaft...)

I've also corrected several places where certain wooden arrows were listed as "plastic" material.