The Hydraulic Machines 4-in-1 Pack brings four wooden machines to life with hydraulic power. These kits provide hours of interesting building and thoughtful use – building blocks, moving Lego people around the house, and for those who want to give their mouse the ride of his life! Kits included are: Mini Scissor Lift, Mini Platform Lifter, Mini Cherry Picker, and Mini Excavator. Learn how to use water pressure in syringes and rubber tubes to control a platform lifter, a scissor lift, a cherry picker, and an excavator. Built from pre-cut and pre-drilled wooden parts, these machines will provide hours of fun and hands-on learning. The models vary in size but range from 18 cm (7\") to 24 cm (9.5\") high. Models are packaged in individual bags inside the box. All four machines can be built at the same time - no parts are shared between the models. Some assembly and gluing is required. Scissors or a sharp knife are needed to cut tubing; glue is included. This is a great product for anyone interested in STEM fields such as engineering or the manufacturing industry. These machines function on some of the same hydraulic principles that drive real world machines. Each kit comes pre-cut and ready to assemble (glue included) Easy to understand instructions Suitable for beginner model makers These hands-on models are a great way to introduce simple machines and levers to kids of all ages Most models stand between 18 and 24cm high when fully extended and can hold things like a glass of milk, mice, small toys and plastic animals, false teeth and other items.