I just took a look at your website (www.starrflight.com). A very nice website! I do have some questions/comments on your FOB. My comment would be that you probably don't want to shoot at the same spot on the target when you practice. It looks like you would destroy them pretty quickly if you would. Questions - How snuggly do the FOBs fit on the shaft? Do they start to slide down the shaft after repeated shots into a target? If they fit snug enough so they don't slide, won't that make them tough to pop off when shooting an animal and possibly HINDER pass-throughs? Do they pull the nock off as well when popping off the back (this would make it even harder for them to pop off)? Finally, have you done cold weather testing? Does the material become brittle at lower temps?