ZIG Memory System Calligraphy Metallic markers are ideal for scrapbooking and other crafts. They have archival quality, are acid-free, waterproof and photo safe. perfect for using on dark cards and can also be blended along with ZIG Memory System Calligraphy pens (MS3400). As they have a square tip they can be used whether you are right-handed or left-handed giving ease and comfort for every crafter! One end has a 3.5 mm square tip while the other has a 2.0 mm square tip. Please Note: 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. Water-based pigment ink, Photo-safe, Acid-free, Light-fast, Odorless & Xylene-free. Waterproof, Archival quality, Ideal for sc.