thanks mac87 i will give them a try.i know the say to crest your arrow in a bright color because if you have a pass-thru on a animal the FOB pops off leaving your bare shaft somewhere,or passing thru a target.i have camo ST axis and dont like losing $10 in the weeds but i am going to order them and see how they fly..do they come with a special nock to hold the FOB in place??