Specifications: Product Name: Double Line Contour Pen Set Material: Plastic+Water-based Pigments Color: 48 Colors Quantity: 48 Colors/Set Single size: 19.1*13.5*3.5cm Uses: Greeting Cards, Posters, Paintings, Photo Albums, Child gift. Usage Instructions: 1. First, put on the cap and shake the pen holder to mix the ink. 2. Second, press the tip down for a while on the paper until the ink flows to the tip. 3. If not appear double line, please do step one again. 4. For best results, re-cap the pen immediately after use and store it horizontally. Package Includes: 1 Set Double Line Outline Pens (48 Colors) Note: 1. The size of the manual measurement may have some error, it is within the range of ±2 cm, the actual size shall be subject to the actual object. 2. Due to different lighting and shooting conditions, the color of the image may differ from the actual product. Please refer to the actual product. ❤These incredible outline pens are written in vivid colored borders. 48 different colors are provided, which can produce vivid colors and increase the glittering luster. Unique technology will automatically generate contours for you to create beautiful two-color effects. ❤The outline pens made with written in metallic silver surrounded by colored borders, creating a beautiful dual-color effect, The water-based ink is chemically stable and fade resistant, in line with the safety standard, quick-drying, non-toxic, odorless, environmentally-friendly. ❤With 48 vibrant colors, 2mm medium point tip, these shimmer pens outline metallic, that add more brilliant whether you're drawing, journaling, writing, or highlighting, stimulate your interest in learning and make notes fun. ❤Write like a normal pen without deliberately increasing pressure, and provide clear, clean lines every time. The ink has adhesion, bright and clear colors, beautiful lines, and easy to write. Suitable for child and all ages of people to use safely. ❤The outline pens are great for making color letters to DIY greeting cards, graffiti, poster making, drawing, journaling, art crafts, DIY photo album. Also suitable for almost any surface, such as rock, metal, ceramic, wood, glass, plastic, stone.