Welcome to our store! 1. [Complete DIY Kit] This toy set includes all the wooden parts and accessories you need to build an impressive hydraulic excavator from scratch, providing hours of fun. 2. [Unique Hydraulic System] This model uses syringes to control the grabber, teaching children how to operate levers and connecting rods in a hands-on way. 3. [Easy Assembly] All parts are pre-cut, making assembly simple without the need for tools or glue. Enjoy a hassle-free building experience. 4. [Educational & Fun] Suitable for children of all ages, this model is perfect for classrooms, libraries, homes, or offices, promoting STEM learning and problem-solving skills. 5. [Kid-Friendly] Made from safe wooden materials, this model is child-friendly with no sharp edges, offering a great tactile experience. Item Type: Hydraulic Excavator Model Material: Composite Wood Usage: Handmade, puzzle teaching Principle: By imitating the hydraulic effect through four sets of needle cylinders, the excavator can move up and down, left and right, and dig. Package Includes: 4 x Boards 4 x 3ml Syringes 4 x 5ml Syringes 4 x Tires 1 x Screw Accessory Kit 2 x Long Shafts 6 x Short Shafts 1 x Screwdriver 2 x Cable Ties 1 x Hose