As a teacher Expo whiteboard markers are by far my favorite.  This set does not disappoint.  It comes with 4 markers  - red, blue, black and green, a whiteboard eraser and a caddy.  I used the enclosed magnetic strip to attach it to my whiteboard  - making it all really accessible.  Caddy stays up well and stays place. The markers all write really nicely.  Expo ink gives nice clean lines and is easy to erase and clean up.  Really like this set especially being back in the classroom!