Rio icon collection features:

• 730 Unique Icons
  
  
• 7 File formats – These icons are much more than just icons. The supplied formats allow them to be used in any project you want, applications, webs, movies, documentation, etc. Formats included Windows ICO, Mac ICNS, Photoshop PSD, JPG, PNG, GIF and BMP.
  
  
• 10 Sizes – 256x256, 128x128, 96x96, 80x80, 72x72, 64x64, 48x48, 32x32, 24x24 and 16x16. All of them nice and crisp. They have been manually resized to get the very best resolution possible at each size.