Roskoe- they are 25/64ths. which would be slightly larger than 3/8"[:-]

GMMAT- bow still waiting on parts.... and element is being parted out and sold...(hopefully) so im kinda bowless with a bow, im callin the guy today, to see about my modules. Still waiting on my strings to arrive and havent bought a rest yet....

twildasin- Ill just be using these for 3-D Ill be going back to my GT 55-75 for hunting, these arrows are incedibly light im barely pushing 325grn. but thats just guessing, i havent weighed them yet.