Unique Design Metallic MarkersThis outline marker is different from ordinary markers on the market .Shimmer marker set has a bright metallic 1.5-2 mm refill. When outline marker set are written on paper, a circle of bright colors will appear around the color. Unique technology automatically generates contours for you to create beautiful two-color effects. Environmentally Friendly Outline PensOur outline metallic markers are made of opaque ink, which is safe, non-toxic, tasteless, acid-free and environmentally friendly. Because of the high quality of super squiggles shimmer markers, double line markers have strong adhesion and high-quality fiber nibs, which can write on almost all surfaces, such as white paper, Easter eggs, Halloween pumpkins,etc.,after writing Quick drying will not blur the color. 12 Colors Double Line Outline Marker Different Glitter Colors Containing Shimmering Ink, Which Yield a Vivid Color and Add a Sparkle Luster. Also Suitable for Almost Any Surface, Such as Metal, Pottery, Wood, Glass, Plastic, etc. Easy to UsePlease close the double line pen cap, shake the pen holder up and down, and press the nib on the paper for a while until the ink flows to the nib. Please close the cap after use to prevent the outline pens ink from drying out. It is recommended to write on some thick paper, otherwise slight scratches will appear.