Parkrun Token Sorter

I was frustrated with trying to sort the tokens on a small uneven area, so I came up with this. Each slot is designed to take 10 tokens. The units will loosely fit together to make them a little more stable. Can arrange them in different orientations depending on your available work space.
We've been using them for a couple of months now at our local parkrun and they're working well.
I've included a single non-numbered unit