Jigsoar Icons is a minimal style icons set that have been released by their creators and that you can download from their official website totally free to use in your web designs, graphic designs, interface for programs or mobile applications and in everything you can think of.
The icons have a very clean and simple design, so they can be used at very small sizes because what they represent will be perfectly visible.
When you download the pack you will see that the 60 files come in PNG with transparent background en 4 different sizes (16px, 24px, 48px and 64px) and also a AI file with all vectorized icons that you can use in any design you want, even use them on your mobile as an icon pack for the menus if the device gives you the option of customizing them with new icons.
These icons have been designed by the company to advertise, it is a good system, do something for free and give it to your followers to get some publicity and start your business ... so let's help these guys who give us their icons and let's give them some publicity;)
Source | Jigsaw icons