Feature: 1. 4 Sets in Pack: There are 4 sets of 3D wooden puzzle, including plane, helicopter, excavator, and racing car for more fun. 2. Play and Learn: During assembling, children's basic science knowledge and their hands on ability will be largely improved. 3. Ideal Presents: Specially designed for 6-14 year old kids, an excellent present for birthday, anniversary, Christmas, etc. 4. Enjoy the Time: You can guide you children and spend fun DIY time with time, bringing more enjoyment to their childhood. 5. Great Material: The application of high quality composite wood material without paint ensures higher safety for you. Specification: Item Type: 3D Wooden Puzzle Package Includes: Electric biplane glider set, solar helicopter, tire type four way excavator, four wheel drive racing car (required 2 x AA, shipped without battery) Material: Composite Wood Function: For hand crafting and puzzle teaching. Paint: Without Paint. Package List: 1 x Electric Biplane Glider Set (2 x wooden board, 1 x battery case, 1 x 20 iron shaft, 1 x 40 iron shaft, 1 x screwdriver, 17 x screw, 2 x shaft sheath, 1 x propeller, 3 x rubber ring, 3 x pulley, 1 x motor) 1 x Solar Helicopter Set (1 x generator, 1 x solar photovoltaic panel, 1 x double sided tape, 1 x shaft sheath, 2 x wooden board) 1 x Tire Type Four Way Excavator (4 x wooden board, 4 x 3ml syringe, 4 x 5ml syringe, 4 x tire, 14 x shaft sheath, 9 x short screw, 28 x long screw, 2 x long shaft, 6 x short shaft, 1 x screwdriver, 2 x cable tie, 1 x hose)1 x Four Wheel Drive Racing Car Set (2 x wooden board, 4 x wheel, 4 x shaft sheath, 13 x screw, 1 x screwdriver, 1 x screwdriver, 1 x motor, 1 x battery case, 2 x steel bar, 2 x pulley, 1 x large gear, 1 x small gear, 1 x rubber band)