It is a web centric icon set by Rocket Theme. It is a nice collection of icons & can be used on different projects as it is released under the creative commons 3.0 license. This icon pack packed 6 standard sizes, each hand-edited to ensure the utmost quality for each size. each icon comes in 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels in transparent PNG format.
Below you can see an example of how each icon size is hand crafted to ensure details are size-appropriate to each pixel is perfectly place.
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