The Pentel Arts Aquash Water Brush Broad features a large, refillable water reservoir barrel and a flattened design that prevents it from rolling off flat work surfaces. The broad, flexible nylon tip delivers a steady, controlled fluid flow when the barrel is gently squeezed, making it excellent for wide watercolor washes or blending pigment pencils. This durable, leak-proof brush is an ideal portable tool for urban sketchers, students, and outdoor painters who want to create on the go without carrying separate water cups.