BIC Intensity® Fineliner Medium writes like a pen, and is bold like a marker. This pen has bold colors, that won't bleed through paper* (*Results could vary based on paper characteristics). The pen features a medium tip (0.7mm) that provides colorful writing that stands out on paper. The pen has a smooth application and has water based ink which makes it perfect for writing on paper. This pen is perfect for notetaking, creative writing, adult coloring, and journaling. This pen is also ACMI approved ,non toxic.