Double-line outline pens - What it is - A set of outline markers that produce a double-line effect with a metallic silver inner line surrounded by a colored boundary. Available in 12 colors, including bright inks that create shimmering color outlines. - Key benefits - Eye-catching double-line outlines with a metallic silver core and colored boundary for emphasis and decoration - 12 color options provide a wide range of visual effects and styles - Waterproof, chemically stable pigment ink with UV resistance for durable results - Smooth, quick-drying application that dries fast after use - What surfaces it works on - Suitable for metal, ceramics, wood, rubber, glass, plastic and stone, making it versatile for many projects - How to use - Shake the marker well to mix the ink - Remove the cap and press the tip on the surface several times to start the ink flow - For best results, use the marker again after use and store it horizontally - Usage scenarios - Writing greeting cards, creating posters, drawing, and adding emphasis with decorative outlines - Suitable for DIY crafts by children or adults, school projects, and other art activities - Care and maintenance - To extend the life of the pen, follow the usage steps before each use - Replace the cap after use and store the marker with the end of the cap in place, kept horizontally