Features:*SAFE MATERIAL: Quick drying, fade resistant, and safe for kids and adults.*Double Line Effect: These self-contour markers write in vivid metallic silver with a colorful edge around them. The unique technology automatically generates outlines, creating beautiful two-color effects for you, and the lines you write are very smoothly, and the ink adhesion is also very good.*WIDE APPLICATIONS: Suitable for art, school projects, black paper crafts, DIY crafts, painting, gift making, petroglyphs, holiday decorations and more.*Easy to use: Shake the pen before each use to allow the ink to mix well. Remove the cover and press the nib lightly on the paper for a few moments until the ink flows to the nib. Cover immediately after use and store horizontally for best results. It is recommended to write on thick paper, otherwise the ink will bleed through thin paper.*This highlighter set is a great gift for relatives, friends, children on Christmas, Birthday, Thanksgiving, Children39;s Day, Easter and other festivals. Notice:1.Actual color may be slightly different from the image due to different light effect2.Please allow 1-3cm deviation due to manual measurement Description:Material: plastic, water-based inkSize: 12 Colors: 14.7*13.8*1.5cm/24 colors: 17.4*14.7*3cmInstructions for use: 1. Shake up and down 2. Press upward to exhaust 3. Press downward to discharge ink 4. Can write Package List:12 colors x Outline Markers Setor 24 colors x Outline Markers Set