gc 100 dual tip brush pen coloring markers set flexible brush fineliner tips - watercolor based markers for adult coloring books manga calligraphy hand lettering bullet journal pens drawing markers 100w gc writing quill gc quill dual tip brush art marker pens have a versatile and flexible nylon fiber brush tip on one end that creates medium or bold strokes by simply changing brush pressure. the fine tip on the other end is for smooth straight lines or writing. they are the highly pigmented colors you're missing in your collection. they are built with dual tips that are fine and broad to allow you to be creative with a variety of vibrant color options. it works well with no skipping or ink flow issue. the ink dries fast and doesn't smudge and is acid-free & non-toxic. it conforms to astm d-4236. 100 vibrant colors including all the primary colors that artists need for drawing lines & details, painting, sketching, journaling, signing, illustrations, doodling, hand lettering, shading, rendering, manga and more. the colorless blender allows you to blend it with darker colors to create your own customized colors! flexible brush tip gc quill dual brush pens are available in 100 brilliant colors! use the flexible brush tip like a paintbrush to color quickly and create fine to broad strokes. the nylon brush tip retains its tip stroke after stroke! fine tip at the other end of each dual brush pen is the fine tip for consistent thin lines. strong and unmashable, the fine tip is perfect for adding colorful details and journaling. important notes: 1. for optimal performance please ensure the marker caps are secure when they are not in use. 2. please do not pull the cap directly and roughly, since the different air pressure inside and outside the caps may lead the ink to leak out. specifications: -weight: 1.6 pounds -pen size: 6.3 inch long -package demission: 11 x 6.5x 2.0inches -color: 100 colors -package includes:100 x marker pen this is the perfect gift for arts and crafts, designs etc. fit for artists, students, and kids.