Pumping Model Hydraulic Hammer Build a hydraulic hammer that has a motor and works with water and air! Size: 22 x 17.8 x 21 cm Color: as shown (you can paint your favorite color) Material: wooden, electronic components Batteries are not contained Assembly instructions are contained This product is not ready, you will manufacture it yourself. Easy construction since its pieces are pre-cut !!! There are all the materials needed to make your construction. Ages 12+