The "3D hand" used in the example is here.
[3D] Hand of the woman ver. 2
https://assets.clip-studio.com/ja-jp/detail?id=1931481
[3D] Male hand ver. 2
https://assets.clip-studio.com/ja-jp/detail?id=1895464
There are also other popular series "3D Legs" and "3D faces".
Please check the "one-click Background" from the other material.