Files - OBJ and FBX with uvs ready to import in others 3D software and drag, drop maps to work.

Posable - Divided into polygroups, they can easily be articulated in the desired pose.

ZBrush Project - You can customize the choice, and get total control of the anatomy without disfiguring details. You receive the project with folders organized by hand, fingers, forearm in separate tools together with mid poly and high poly in 5 SDv. (commercial license)

Substance Painter Files (.spp) - Each arm and hand has its own Substance project, you can customize the colors, export the maps again and everything works perfectly, giving you the freedom to have a unique project.

https://www.artstation.com/marketplace/p/XKayp/20-scifi-arms-gameready-v-2-pbr-maps-render-scene