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Plastic Material: Hydraulic robot arm kit is made of high quality plastic material, safe and eco friendly, firm and sturdy, stable and wear resistant, durable.Reasonable Structure And Design: The arm can be rotated 270 degrees from the base.Kids can easily switch between grab or suction cups depending on what they are moving.Hydraulic Power: No need batteries and motors, water can drive the mechanical arm, the principle of hydraulic power, use operating lever to control various joint activities of mechanical arm.3 In 1 Hydraulic Robot Arm: Clamp, suction cup and hydraulic grab, give full play to your imagination, feel the fun brought by the hydraulic mechanical arm.DIY Assembly Toy: Mechanical arm is constructed by a variety of components, kids need to assemble them together, develop hands on and thinking skills....