This is a neat 'packing' puzzle designed by George...made from Jatoba and Maple by the Pelikan Workshop, with a plexiglass box to contain the 5x5x5 solution. All the 'bed' shaped pieces also make a 5x4x4 as well as a 3x4x4 brick, and then using only five pieces you can form a 4x4x4 cube and yet again with seven pieces you can form a 5x5x4 brick! Very versatile set of pieces, making this a cool puzzle, comes with the solution sheet with a link to more info on George's website.