Persistence pays off. We found these blue water soluble markers at a great price, as usual we are passing the savings along to you. These markers are some of the best we have tested. Easy to use, easy to see, and easy to remove with Blue Line Eraser. But wait.....this is the exciting part.... I've had one stored in the freezer for over three years now and It hasn't dried out yet! Yes, I did say freezer, why..... to prolong the markers life. We recommend storing them in a zippered plastic bag rolled up and placed in the freezer. Before using it bring it to room temperature and your're off for another marking adventure, of course you can use them up, but they won't dry out before you use it up!