Clover Fabric Folding Pen (4053)

I didn't understand how this pen works until I viewed a YouTube presentation and now I'm sold. The set has an empty pen and a bottle of a clear liquid. You fill the pen with water and drop in a few drops of the clear liquid - shake it up. Let's say you want to turn under 1/2" of fabric. Lay your ruler down at 1/2" from the edge and run the pen along the ruler making a wet line. You simply fold over your fabric on the line and it stays without pressing. It even works for applique on curved edges. Go to YouTube and put "fabric folding pen" in the search and you will get your own personal demo.