Okay fine young people- i did not get any response for these devices. I now that somebody has probably used them. I know it seems assanine, but, as i have mentioned, i could lose a deer at 25 yards before going into thorns & rattlesnakes to look for a blood trail. I have seen on the website that they are not supposed to affect arrow flight up to 40 yards even though they weigh 50 gr. (even spook spann says so, i think thats bullsh!!t) any feedback?