Explore the fascinating world of hydraulics and construction with the Little Story DIY Hydraulic Power Principle 3-IN-1 Excavator, Bulldozer, and JCB Toy by SAMBOX. This versatile STEM educational kit includes 130 pieces made from safe, eco-friendly, and durable ABS plastic, designed to be assembled into three different construction machines to suit your child’s play and learning needs. Powered by hydraulic technology, the toy requires no batteries or motors - water drives the mechanical arm and hydraulic jaw, which rotates 270° for digging, lifting, and collapsing. The kit encourages creativity, problem-solving, and fine motor skills development through hands-on assembly guided by a detailed instruction manual. Ideal for children aged 8 and up, this EN71 certified toy is perfect as a birthday, Christmas, or educational gift to inspire young engineers and scientists. little story diy toy hydraulic excavator toy stem educational toy diy bulldozer kit hydraulic power toy 3-in-1 construction toy jcb toy for kids diy assembly toy stem learning kit eco friendly plastic toy