SMAs are made of special metal alloys (nickel-titanium) that remember their original shape. When SMAs comes into contact with a small electric current, the metal heats up and contracts. When you switch the electricity off, the metal cools down and returns to its original shape. These materials are formed into bundles of 0.5mm thick wires, each of which can lift 22 pounds (10 kg) of weight without breaking.
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