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

Matreshka [bitmap]

Ammount of icons:
8

File Types:
.png: 
700x700(32bit)
512x512(32bit)
256x256(32bit)
128x128(32bit)
48x48(32bit)
32x32(32bit)
24x24(32bit)
16x16(32bit)

.ico: 
256x256(xp)
128x128(xp)
48x48(xp,256,16)
32x32(xp,256,16)
24x24(xp,256,16)
16x16(xp,256,16)

.icns: 
512x512(rgb/a)
256x256(rgb/a)
128x128(rgb/a)
48x48(rgb/a,8bit,16,mono)
32x32(rgb/a,8bit,16,mono)
16x16(rgb/a,8bit,16,mono)