A full practice hand with articulated finger joints and an adjustable clamp that fixes it to the table. The clamp is what separates this from a loose practice hand: you work against resistance the way you do with a real client, instead of chasing the hand across the desk.
The joints bend and hold position, so you can set the hand at the awkward angles that actually need practice, the thumb and the little finger, rather than only the easy middle three.
