These icons are from Icojam (http://www.icojam.com)

Minicons Graphite [pixelate]

Ammount of icons:
80 

Icon Sizes:
16x16

File Types:
.png: 
16x16(32bit)

.bmp:
16x16(24bit+1 special color)

.gif:
16x16(8bit with transparency)

.ico: 
16x16(xp,8bit)

.icns: 
16x16(rgb/a,8bit,mono)