Sizing Icons size is ~128×128, you can scale them down up to 32×32, all icons look fine in 32×32 resolution, some of them are fine when smaller, too.
Packaging: -All icons are saved as a separate .png files. -There’s also the all-in-one psd as well as png file with all icons (as separate layers) in one file. Psd file includes a few color presets.
Flexibility -Since the icons are monochrome it is extremally easy to change their color via altering hue/saturation hence they are very versatile. See all-in-one.psd for example presets. -Icons set works well with both dark and light backgrounds.