A box for holding 24 color pencils. There are two models, one for Crayola (7.2mm) and one for Prizamcolor pencils (7.5mm). The model uses six 6mm x 1.65mm magnets to hold the tray in the box, they are not strictly nessassary, but they do hold the tray in place nicly. The print profiles have three pause points for inserting the magnets. The first pause is for the three magnets in the tray. The second pause is for one magnet in the box, it is in the middle of the bottom part of the box. The third pause is for the two magnets in the box at the top of the box, toward the outside of the box. The slots in the box can be a bit hard to see, but you should be able to see an outline throught the filament, if not maybe shine a flashlight on the back, that should make them easier to see.