Feature:1. [Complete DIY Kit] This toy set provides a complete set of wooden parts and accessories, allowing you to build an impressive hydraulic excavator from scratch and enjoy hours of fun.2. [Unique Hydraulic System] This model uses syringes to control the gripping action, teaching kids how to operate levers and connecting rods in a hands on manner.3. [Easy Assembly] All parts are pre cut, making it easy to assemble without the need for tools or glue. Enjoy a hassle free building experience.4. [Educational and Fun] Suitable for kids of all ages, this model is perfect for school classrooms, libraries, homes, or offices, promoting STEM learning and problem solving skills.5. [Kids Friendly] Made from safe wooden materials, this model is kids friendly with no sharply edges, providing a great touch experience.Specification:Item Type: Hydraulic Excavator ModelMaterial: Composite WoodUse: Hand made, puzzle teachingPrinciple: By imitating the hydraulic effect through four sets of needle cylinders, the excavator can move up and down, left and right, and dig down.Package List:4 x Board4 x 3ml Syringe4 x 5ml Syringe4 x Tire 1 x Screw Accessory Kit2 x Long Shaft6 x Short Shaft1 x Screwdriver2 x Cable Tie1 x Hose