Faber-Castell Deluxe Water Brush Pen - Refillable Aqua Brush Pen for Watercolor EASY TO USE - Easily control the flow of water and see when your pen needs refilled with its translucent barrel. SOFT BRISTLES - Create a watercolor work of art with precision and detail. USE ON MIXED MEDIA APPLICATIONS - Great on water soluable mediums like Gelatos and watercolor pencils LEAK PROOF AND REFILLABLE - Reuse your watercolor brush pen for many projects to come! This brush is leak proof and easy to use. FABER-CASTELL QUALITY ART MATERIALS - See your artwork come to life with the absolute best quality art materials. Faber-Castell been a creator of quality art materials since 1761.