Its a rigged hand using only weights, no corrective shapes are used so its deformation system is rather simple, the bones weights are however painted well enough to support a number of poses.

For version 1_6 I'm starting to use corrective shape keys, and also the rig is now controlled using AutoRig Pro.

However the version that is using Rigify (1_5) is on the zip files for the product, and all the versions of the hand will always be available, from the first to the last.

These youtube video shows how the 1_5 hand deforms:

https://youtu.be/8bGlq87Q88g?si=6RWYkeOraAGQ1huS

These youtube video shows how the 1_6 hand deforms:

https://www.youtube.com/watch?v=STA2oj7sfn4

I created it so I could pose the hands of my 3d printing character easier and faster, since adding the hands is the most time consuming part of my sculpting process, I thought that maybe some other people could use it to their benefit, its a bare bones hand, but if you are in a hurry for a simple serviceable hand, I think this product will do the trick for you, as it did for my projects.