ZIG Memory System is the premier line of markers designed specifically for scrapbooking and precious paper crafting. It has been continually named the best markers in the memory craft community. Their products are acid-free, lightfast, water-proof, fade-proof and non-bleeding. Memory System exciting, innovative range of pens, and markers are designed to give you all the options for preserving treasured memories and valuable archive material. Any dual tipped markers must be stored in a horizontal position. If they are not positioned correctly this will result in one of the tips becoming dry and un-useable.