Superelastic Nitinol Wire 6-Pack Sample Pack 0.3-2.0mm (12-28 Gauge) ASTM F2063 SE Wire

This is very neat! Applying heat will cause it to resume it's "remembered" shape/form. Keep in mind they have specified activation temperatures. I bought a variety from different sources, all arrived in good condition and nothing was missing. I don't recall what the activation temperature was for these, but the 40 Celsius activation variation is really not useful, for me at least, since it needs to be practically frozen to be malleable, but the heat from your hands will make it immediately stiff, so not very good at demonstrating the novelty of it! Also, unfortunately, most just go stiffly straight when activated, this was not the desired effect I was looking for, I wanted contraction, so beware of the variations in these types of wires when making your selection for purchase.

This does not hold a shape and react to heat the way it should. It appears to be simply vinyl coated spring steel