Ecoline Brush Pens utilize a re-wettable watercolor ink, perfect for watercolor-ready surfaces and achieving watercolor effects without the complexities of traditional paints. The ink is not lightfast, so artwork should be stored away from light for longevity. These pens feature versatile tips with both broad surfaces and fine points, allowing for thin or broad stroke lines. Available in a variety of colors and a colorless blender for seamless color blending. This product is a favorite among artists and calligraphers for its transparent liquid watercolor ink, offering vibrant and vivid colors. The quick-drying ink is based on dyes and Gum Arabic, contributing to its intense hues. The ink blends and mixes exceptionally well with water or the included blender pen. The brush pens have a large, soft, and pliable fiber-brush nib, ideal for various line widths and effects, maintaining its shape over time. The water-based ink is not particularly light-fast, so storing artwork in a portfolio is recommended for best color retention. Available in a wide range of colors plus a blender pen. This juicy brush pen delivers intense, saturated dye-based liquid watercolor that dries quickly, can be rewetted, and is blendable, yielding great results on paper or board. Each pen is 5.5 inches long and conforms to ASTM D 4236. Warning: Choking Hazard - small parts. Not for children under 3 years. Comes in a variety of colors, each sold separately.