Hi All, I use individual dry erase marker boards a lot in my class. I am about ready to order supplies for next year and I want a dry erase marker that lasts a long time and the tip can't be pushed in. I currently let my kids use Expo chisel tip. The ink lasts for years, but the tip ends up being pushed in on a good percentage of the markers. Expo chisel tip are the only kinds of dry erase markers I have ever used (other than dollar store brands that run out of ink in a month), so I'm looking for your opinions. I have a couple of questions to ask you guys: Do the Expo bullet tip markers get pushed in or fray? Are there any other good brands that don't have problems with the tip being pushed in? School Smart? Marks-a-lot? Crayola? Bic? I saw a dry erase crayon by Trend. Has anyone tried these out? Thanks in advance for all of your opinions and help!