Best markers/pencils for adult colouring book

rustyzip

my brothers wife is suffering badly with anxiety and loves to paint.
I have bought her some adult colouring books but don't know which markers/pencils suit them?

Jellybaby1

Colouring is a great therapy. I use Promarkers for colouring in rubber stamped images and also images from children's colouring books. You can get them in Art & Hobby type shops, Cork Art Supplies or online. Those stores could suggest others but I like Promarkers. I sometimes download colouring images from the internet, there are lots of free colouring images for children and adults if you Google it, like these:

http://www.supercoloring.com/
http://sherimcclurepitler.com/freeadultcoloringpages/
http://www.coloring-life.com/en/adult-coloring-pages.php