11.3 grains per inch, 30 inch arrows, 100 grain head, thats 439, but you add the weight of the veins and insert too dont u?, they have 4 inch carbon express veins that came on them..by the eay these are carbon express Rebel hunter arrows( are they junk? i just baught them and they seem good so far..says built in weight forward or sumthin like that ) ........thanks