Iconset: Free simple line mix (https://www.behance.net/gallery/65549095/50-Free-simple-line-icons)
Author: Just Icon (https://www.behance.net/justicon)
License: Creative Commons (Attribution 3.0 Unported) (http://creativecommons.org/licenses/by/3.0/)

Buy the full set here:
https://creativemarket.com/Justicon/2553189-750-Simple-Line-Icon-x2