Intensity Stick Porous Point Marker Pen, 0.4mm, Assorted Ink-barrel, 21-setColor Collection by Intensity Fineliner Marker Pen provides vibrant colors and bold, crisp writing. This pen is perfect for writing, doodling and drafting and great for adult coloring. The water based ink won't bleed through paper (Results could vary based on paper characteristics). Pen Sub Brand & SKU Line: Intensity; Pen Style: Stick; Pen Type: Porous Point Pen; Refillable (Yes No): No.