I got a 4 pack of these markers and gave them to my 3 year old daughter for her dry/erase board.  There are a few things I love about these markers.. 
1.  The markers are very easy for my daughter to hold and write with, she is able to get a good grip for her drawings.
2. They are very low odor which is important to me when letting her use dry erase markers.
3.  They erase very easily so she does not have to press hard when using her eraser.
We have been using the markers for about 2 weeks now and the colors are still very bright! The only complaint my daughter had was that she wanted more colors!  I would highly recommend these markers to anyone!