Package Include - Package include 4 dual tip pens, suitable for almost any surface, such as metal, pottery, wood, rubber, glass, plastic, stone, etc. Dual Tip Design - Two kinds of fiber tips meet different use demand. Can not only create bold marks and clean lines, but also create extra fine lines filling shapes. Perfect for filling and thinning outlines. Both types of tip are fluid and smooth to write and draw. Good Quality - Made of quality opaque ink, our black marker pens is safe and durable, eco-friendly, quick drying, fade resistant, have strong coverage, waterproof, chemically stable and UV resistant. Easy To Use- Each pen is measuring 18.5CM(7.28inch), the pen proper length to hold and use. For best use experience, re-cap the markers immediately after use and store horizontally. Wide Application - Our outline pens can be used in writing a gBeginners writing sketches and drawing. Besides, they are also suitable for kids or adults DIY craft projects. Great for arts, crafts, school projects and more. 4PCS Dual Tip Pen Black Calligraphy Pen Dual Brush Pen Art Marker Double-end Markers Fine Tip Pen for Beginners Writing Sketches Art Drawings Scrap Booking DIY Art Crafts