Uses a #2 Pencil for the arrow shaft. One size fits all. This was part of a last-minute Halloween costume, but it needed some tweaks before it was Thingiverse-worthy.I'll be here all week! Try the veal.Cut a #2 pencil in half (a hacksaw works great for this) and attach the fletching and arrow head pieces to the two halves of the pencil.The bore on the fletching is just a wee bit larger than the arrowhead bore so that you can fit the eraser end of the pencil into it. If the bores are too big, just wrap a piece of tape around the end of the pencil.Jam the free edges of the pencil halves into the holes on the band. It should be a very snug fit.