in search of commercially available artificial muscle

I’m looking for some kind of device (open to all possibilities right now) that has the following requirements:

  • Fast
  • Strong
  • Silent
  • Linear or rotational actuation
  • Does not need to be stepped or precise

I don’t mind if it’s bulky or has high power draw. The goal is to actuate robotic limbs.

Recommendations or suggestions?

I’ve looked into TCP and SCP but there do not appear to be any commercially available solutions yet.

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