This is a smaller and "prettier" version of my previous dice tray and dice holder. It still won't fit on the smaller 150mm square beds, but it's now 180 x 120 x 30mm. Magnets used are 5mm x 1mm. The inside rolling area is ~112mm x 118mm.
D20 logo by Andrew Doane: https://thenounproject.com/term/d20-dice/763027/