Learn more about the power of water and robots with this awesome hydraulic cyborg hand! The kit comes with everything they'll need 203 pieces, to be exact to build their very own cyborg hand and watch it move using only the power of water.. The hydraulic cyborg hand will simulate the movement of human hands fingers, using hydraulic power for mechanical transmission it'll also allow every finger joint to adjust at different angles for close fist or open palm precisely! It's a brilliant way of introducing children to reusable energies and requires no motors or batteries product details ages 10 build your own cyborg hand uses the power of water to create movement no batteries required 203 pieces