Starter Site: Web Agency Icon free use?

Hello, I use the starter site “Web Agency” from Blocksy Theme, and I have a question: are the icons (svg) free for use or where can I buy the icons like svgs (marketing-icon.svg or development-icon.svg…)? Where can I find the stock photo agency? I would like to use these icons but where can I buy this?
I Like marketing-icon.svg or development-icon.svg and so on and I would like use this icons how brand-icon.svg or pin-icon.svg.
Can you help me? I would buy this icon set.