Maybe I just received a batch of duds, but I was so disappointed in these markers I had to get online and review them the first night I've had them. I've worked with these markers less than two hours and already four of them have run bone dry. First the dark orange went dry, so I reconsidered my project and switched to a lighter orange. Then that one went dry. I had to switch to yellow... and you guessed it. The yellow ran dry as well. So I thought, okay, at least I seem to have plenty of green. And then the green went dry. My project is small, just a normal letter-paper sized, and I have to go buy a new set of markers tomorrow to finish it--and I paid $20 for these things? I hardly expected artist quality pens, but I did at least expect to get one project out of them.