Icon set freebie created and released by Ali Yaqub
Available format: .AI, .EPS and .PSD file
In the zip you will find 3 folders: ai, eps and psd folders. Each folder includes 4 files.
License info: According to Ali Yaqub, the author of this icon set, it’s published under Attribution-NonCommercial 3.0 Unported.
You can download this icon set from here