Simply press out the pieces and slot together All pieces come pre-cut: Finished model can be painted or varnished Environmentally friendly product Natural wood - can be stained， laquered， painted， or left as is. No tools or glue requiredthe size of each design， pls see the picture in the certain design.Great fun for both children and adults! The kit comprises of strong pre-cut plywood sheets. The pieces are pressed out in number sequence， and slotted together to complete a fantastic 3-D model. There are over 90 different models in the range to collect from including animals， planes， dinosaurs， famous buildings， ships and many， many more.Exciting and educational， this puzzle would make a great gift for anyone: your significant other， friend， parent， or a coworker!