Look! Tubes!
Well that's great...but what are these things? Tombo is known for making school supplies like pencils, so...these are to be Pencil Tubes! The actual text says "Pencil Caps" in Japanese. You put your sharpened pencil in there before putting it away so nothing can break off the graphite. It's a little...obscure, but technically useful if you didn't have a pencil case or something. With this pack you can see 2 different Sonics, Eggman, Knuckles & Tails, on various pale colors. The art places it around the time of Sonic R.