Bolts for Mini Crossbow
Arrow shoots really well. I designed a very small hole in the end of the arrow it you would like to insert a needle or something (im not responsible for you getting hurt). They also snap into my quiver that I made for cotton swabs ( http://www.thingiverse.com/thing:631601).
After doing some testing... the 30mm bolt is about useless. It just flips through the air instead of straight.