This DIY hydraulic robotic arm model is an excellent engineering toy for kids and adults alike. It offers a hands-on experience in building and understanding the mechanics of a robotic arm. The wooden pieces are easy to assemble, making it a Ideal STEM kit for young engineers. Once built, the hydraulic system allows the robotic hand to mimic real-life movements, providing an engaging way to learn about hydraulics and mechanical engineering. Features -Color:Beige -Material:Wooden,plastic -Size:30.00X12.00X1.00cm/11.79X4.72X0.39in -Hydraulic technology: utilizes hydraulic technology to simulate the real movement of a mechanical arm, enhancing both fun and educational value -Diy assembly: wooden assembly mechanical hand model provides the joy of diy assembly, fostering children's skills and creativity - : the bionic mechanical hand design mimics the movement of a human arm, making it more realistic and engaging -Educational toy: serves as both an entertaining toy and an educational tool, helping children understand mechanical principles and technological knowledge -Enhances dexterity: aims to improve children's manual dexterity and problemsolving skills through interactive play and assembly Package list: 4 arm model