What is the kind of pen/ink you would use for watercolor?

I know that there are specific types of pens/inks you can use for watercolor. The point of them is that you draw the outline of your picture in the pen/ink and when you paint it in watercolor, the ink stops the watercolor from going outside of the lines that you drew. I really need some of those pens, can anyone tell me where I can find them and what they are called or their brand?

I would assume any non water soluble pen would work. What I would tell you to do if get yourself a sponge and a paper towel, and learn water control. set your paints and water on your right side if you are right handed, left side if you are left handed. have your sponge and or paper towel with your paints and water. dip your brush in the water, dab the sponge, get your paint, and dab your paper towel. using a outlining pen with be both limiting and unnecessary if you learn how to control the water in your brush. email me if you need more help