Crisp Icon Set is a free icon set includes 108 pixel perfect icons that come in 3 different sizes, 16×16, 32×32, and 48×48. These are entirely vector and all of the icons can literally be scaled to any size if needed, just keep the aspect ratio when resizing to keep them pixel perfect. It also includeds a Photoshop PSD like always, a retina version, a CSH (custom shape) file, and the PNG icons!

Requirements: -
Demo: http://www.icondeposit.com/theicondeposit:108
License: Creative Commons Attribution 3.0 License