We've carried the Peel Off China Hydro for years, but now it's gone. The manufacturer stopped making it, and we have searched for over two years for a replacement. We have found two very different options that we think you'll be able to use effectively. One is the Markal Trades marker with the hydro refill. It makes a skinny line and comes as a holder with refillable sleeve, so you don't have the peel to throw away, and you can carry the refill pack in your shirt pocket. Here's a nice picture of someone using it in a work environment. 

The second option I have no picture for as yet, but at the end of April, we will be getting another peel off hydro that seems to work as well as the China. It comes in a variety of colors, making it easier to find what you need for the job you have. We've been working with white only for some time, and before that we had only black, red, and white. Now there will be other options. Check the site as Spring comes at us, and we should have that product on the shelves and ready to go.