Use the Pocket Brush Pen to create fine to broad lines with a single brush stroke. Ideal for painting, cartooning, and detailing. Permanent, pigment ink is both water-resistant and fade-resistant. Leakproof fittings and measured ink-flow guard are perfect for the mobile artist. Design guards against soiled clothing and unsightly manuscripts. Compact size and cap with pocket clip make the pen portable. Pocket Brush Pen is refillable with Pentel FP10BP2A refills and includes two refill cartridges.