This palette is perfect for a portable/pocket/plein air art studio. The holes for the magnets are 5mm x 2.5mm. 5mm x 2.5mm magnets can be friction fit. When open and printed at the original size, this palette measures 60mm x 60mm x 8mm, closed it is 30mm x 60mm x ~17mm (depending on the size of your magnets and how deep you set them).