I stumbled onto these a few weeks ago. The nice thing is you get a perfect tip every time. Con is that a pack of 16 runs about 2 bucks. I usually just make my tips flat because I put a couple bbs in mine. The 3/8" fit perfectly on 1/2" FBR. I figure for this guy they should help add some extra weight.Wow, that really is a good idea. They probably need to be trimed slightly so the body of the dart is bigger.
EDIT: I was refering to the 1/2" ones.
They also sell foam and cork pads which might help avoid whelts for those who have very safety concious parental figures.