Neodymium Magnet box

This little box gives you ability to customize your 10 mm magnets.
You can mix colors as you want.
I use Black/Red to symbolise South/North poles.

the magnets I use are available here : https://www.supermagnete.de/wuerfelmagnete-neodym/wuerfelmagnet-10mm-neodym-n42-vernickelt_W-10-N