I get asked every day about the tools I use to make my art. I don't mind sharing, its just hard to keep up with the demand and reply to every person who asks, "what pen is that?" So I made this page to make it easy to share with others. If you see me using something that isn't on this page, please let me know and I'll add it!
I love these markers. I think they are the best for rendering and modeling shapes. They sell refills so if a marker runs dry you can refill it, which I do all the time for my greys. They also sell replacement tips, so if the tip wears out you don't have to replace the whole marker. There's also over 350 colors so your bases are covered there.
I'd start with a basic set like this: