These are inserts for Altoid tins. You need to print 2 to fill the tin. They were designed as a watercolor paint palette. The three tray works as the mixing tray. Put some self adhesive magnet on the bottom of it and it will stay in place on the lid. Un fortunaely you can't close the lid with it in place, so it needs to be removed and placed on top of the paint pans. The bottom inserts need to be squeezed into the tin and are removable with a little force. They were made this way so they don't fall out