There are 108 individual icons in this icon pack with an additional 15 icons in a bonus folder containing a random collection of Software and Media icons. There are 13 size formats from 392 x 392 to 20 x 20 . You can swap out your icons manually one at a time or you can load this package directly into the IconPackager Software sold by Stardock ( https://www.stardock.com/products/iconpackager/ ) and change all your icons all at once. Either way , these icons are compatible with any operating system.