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Analysis · October 25

Protoclone: a robot with a thousand artificial muscles and a 206-bone skeleton

Clone Robotics is building an android that copies the human body: a polymer skeleton, artificial muscles and tendons. What is known about the prototype and what the demonstration shows.

Protoclone V1 suspended from a frame in a workshop
Photo: Clone Robotics

This robot has more than a thousand artificial muscles, and its skeleton follows the structure of the human body. This is Protoclone from Clone Robotics. It was first shown in February 2025.

How it is built

  • the polymer skeleton reproduces the anatomy of 206 human bones;
  • artificial muscles and tendons are attached to the skeleton: they pull the bones and bend the joints;
  • ligaments and tendon attachment points follow the human pattern to preserve the natural mechanics of movement;
  • the prototype has more than 200 degrees of freedom, and hundreds of sensors track its position.

According to the developers, one muscle fiber weighing three grams pulls with a force of at least the weight of a one-kilogram load and reacts in less than five hundredths of a second.

Protoclone's movements in the demonstration: the robot is suspended from a frame.
Protoclone's movements in the demonstration: the robot is suspended from a frame. · Photo: Clone Robotics

What was really shown

In the demonstration the robot is suspended from a frame, so this video does not show independent walking. The company's goal is to create an android for everyday tasks, but Protoclone is still a prototype for testing: the developers have yet to turn the unusual design into a useful helper.

The early Clone torso (Torso 2, 2024) without legs: this is how the company worked out the muscle system.
The early Clone torso (Torso 2, 2024) without legs: this is how the company worked out the muscle system. · Photo: Clone Robotics

Hand and power

Separately, Clone tested a robotic hand. In one of the videos the company showed that the whole hand system with its power supply can be packed into a suitcase: according to the company, the entire setup weighs 8 kg. This is a response to guesses that the hand needs a huge compressor, and a step toward a portable design without which a household helper is impossible.

The Clone hand system and its power supply assembled for carrying.
The Clone hand system and its power supply assembled for carrying. · Photo: Clone Robotics

Why this matters

Most humanoids are built on electric motors in the joints. Clone takes a different path: it copies anatomy to get movements close to human ones. The approach is risky and far from a production product, but such experiments show where the limits of the possible lie.

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Frequently asked questions

Can Protoclone walk by itself?

In the video shown the robot is suspended from a frame; independent walking is not demonstrated.

Can Protoclone be bought?

No, it is a prototype for testing. There is no data on sales.

How is Protoclone different from other humanoids?

It copies human anatomy: a polymer skeleton, artificial muscles and tendons instead of electric motors in the joints.

SourceandClone Robotics ↗Clone: Protoclone Bipedal Musculoskeletal Android V1 (YouTube, 19.02.2025) ↗

This guide was prepared by the SHKARAN editorial team from our catalog and manufacturers’ official pages. If you spot an inaccuracy, write to us and we will fix it.