This Letter Tray 3D wooden model puzzle is a favourite for Home Décor. All the pieces of the puzzles slot into each other so the puzzle can be rebuilt as many times as you wish without glue. However, if you would like to display it on a shelf or in a cabinet we would recommend a bit of wood glue to keep it secure over a long period of time. The puzzles are made from wood so they can be painted with normal acrylic paint or spray paint.The puzzles do not come with instructions. The reason behind this is because it is a puzzle… and the fun part is trying to figure out how all the pieces fit together as you would with a normal picture puzzle; so hours of fun can be had with the entire family joining in. But please do not fear as help is only an email away. Length: 335mm Width: 225mm Height: 60mm Nr Pieces: 4 Material: MDF/Supawood 6mm