Dowels - if you have a use for these, you know what they are, I don't need to describe them. The catch is, they're imperial sized, bought in error, so they'll never do anything but sit there and annoy me.
Sizes are 1/2", 3/8", 5/16", and 1/4". There's a pair of matching point markers or whatever they're called in each size. Maybe 50 of the big size and progressively more of them as they get smaller.