What kind of servos are used to control the fingers in a robotic hand?

I am looking for a servo that is small yet capable of exerting a meaningful torque. The servos I find on hobby shops are all too big. However I realized the servos used in robotic hands are small enough to not standout (aesthetically) and still able to apply a good amount of torque. Where can I find them? What are they called? Any help is appreciated.

submitted by /u/yalogin
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