Editor’s pick
Thames & Kosmos Mega Cyborg Hand
Build a giant wearable robot hand powered by water pressure
About $45brand list price View on Amazon
Thames & Kosmos Bionic Robotic Arm
A cable-driven robot arm that moves like a tentacle, no batteries.
Best for kids who love mechanical builds they control by hand.
$54.95Thames & Kosmos list price
This is Thames & Kosmos’s own list price (checked November 13, 2026). Amazon’s price is often lower; tap above for today’s price. Paid link: Electroys may earn a commission at no extra cost to you. Listing verified October 28, 2026. See Thames & Kosmos’s product page.
At a glance
- Age guidance
- Ages 10+
- Price
- $54.95 list price
- Screen needed
- No, fully screen-free
- Batteries
- Not needed
- Adult help
- Varies
- Play style
- Solo or together
- What it is
- Nearly 300 pieces, two joysticks, swappable gripper heads
- Great for
- Birthday, Holiday, Rainy Day
Builders assemble a segmented arm from almost 300 pieces, then steer it with two joysticks that pull nylon cables, much like tendons work in a body. Buttons open, close and rotate the claw, and an alternate head turns the arm into a bionic eel.
Why we picked it
- 01Shows biomimicry and cable mechanics with no motors or code involved
- 02Two-joystick control is satisfying to master for pick-and-place challenges
- 03Swappable gripper heads add a second build
What they’ll learn
Always follow the manufacturer’s age and safety guidance. Small parts may be a choking hazard for children under 3.
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