Fabio Basile released beautiful 106 Pixel Perfect icons set with the name of “pixicus”. The set are mono colored transparent PNG formats with 12*12px sizes.
Items in the set are a good fit to be used in web apps considering there are icons of actions, charts, comments, devices, social networking and more.
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These icons are design by Monsters’Lab completely free for commercial and non-commercial usage. You cannot, however, modify these icons, claim them to be your own, redistribute these icons on another website and/or sell them for a profit.