This is a utility item with no directions. These are made with heat sensitive ink and a felt tip. I make these to order. The only visual difference is the tip is a touch smaller, however, it writes exactly like a regular sharpie. The ink will vanish when heat is applied from an open flame. (see video for example. This ink will not come back until it is put into a freezer for a while. So, no worries about handing it out after the effect.NOTE: THIS PRICE IS FOR 1 Custom Gimmicked SHARPIE.