Works on most toothpaste tubes. If the slot is too small, fold a piece of sand paper in half and sand the inside. If that is not enough, use a piece of paper to shim the sand paper wider (put a piece or two in-between the fold of the sandpaper). The eyes are drawn on with marker!

Like this design? [https://www.buymeacoffee.com/codifer](https://www.buymeacoffee.com/codifer)