[Release Your Imagination]: Whether you’re a professional artist or a beginner, the Spec101 Fillable Watercolor Brush Pens - 6 Piece Aqua Color Brush Set will ensure optimal water control and easy color blending [For Fine Lines and Broad Strokes]: Water paintbrush pens watercolor set includes 6 differing brush sizes; Flat color brushes (04, 07, and 10) create wide strokes for base coloring, while fine tip pens (01, 02, and 03) create fine lines and sharper details [Flexible Bristle Design]: Synthetic nylon bristles are soft and designed to allow smooth clean lines; Quality water pen brush tips will not spray, spread, or smear; Ideal for use with water-based crayons, pencils, paint pans, or powdered pigments [Makes Blending Easier]: Twist top off, fill the water chamber 2/3 full, and twist top back on; Push the silicone button to extract water from the chamber; Water filled brushes refillable paint pens allow you to control how much water you use, making it easier to blend colors and create new shades [Travel Ready]: 6 pack water color pens measure 7.3 inches (18.3cm) tall and include caps to protect your water paint brush bristles when traveling; Fill hollow water markers with water and they will act as aqua painting brushes and water containers in one to make painting on-the-go easier