This set of 12 Colors Double Line Outline Pens redefines creative writing and drawing with its unique self-outline design, blending metallic glitter ink with effortless effects-making it a standout tool for card writing, Diy art crafts, and back-to-school projects. Curated with 12 vibrant, glitter-infused metallic hues, the set delivers eye-catching color that adds depth and dimension to any creation. Unlike standard markers, these pens create two parallel lines with a single stroke: a rich, opaque metallic center line surrounded by a thin, contrasting outline, instantly elevating simple writing or doodles into polished, professional-looking designs.