Aqua brushes are versatile, water-filled painting tools ideal for watercolor, ink, or water-based markers. Each brush has a reservoir barrel you fill with water (or diluted medium), with a soft synthetic brush tip that allows controlled flow for smooth washes, blending, and detailed strokes. Perfect for sketching on the go, illustration, travel art, or hybrid media work. Easy to use and carry — just squeeze to control water flow and paint with ease.