This dual brush pen art markers great for Adult/children coloring books, sketch, draw, color, doodle, Greeting cards,Party invites,write and get creative in a fun and skilled way .The drawing pens can be used for many areas,The drawing pens is perfect for artists, illustrators, animators, interior designers, architects,manga,calligraphy,crafts,some DIY works, render renderings, artist design, animation design, and other drawing,etc.the uses are endless.Just use your imagination, and have fun.