TO ACHIEVE WATERCOLOR EFFECTS: The ink is water-soluble and you can achieve beautiful watercolor effects by pre-wetting an area first with an aqua brush pen (not included) and then color the area with the colors you want to blend. Note: Since it needs water to blend the colors, please used watercolor paper or mix media paper to prevent bleeding. WHAT YOU WILL GET: Each package includes 3 replacement brush nibs, 2 fine tips and a pre-printed number color swatch card for your convenience. Besides, with exquisite and delicate package, this pen set is a perfect gift choice for birthday, Christmas, valentines day , back to school or just a random gift. ACID-FREE & NON-TOXIC WATER-BASED INK: The highly pigmented acid-free allows your artwork to last against fading. It's also a huge plus that the ink is non-toxic and water-based, which is 100% safe for both you and your kids. NON-BLEEDING INK, PERFECT FOR COLORING BOOKS & JOURNALING: The real benefit of these pens is that you do not have to worry about the bleeding-through problem or your paper is too thin to hold the ink. It won't bleed beyond the line or destroy the next pages. Just use the pens to color your coloring book and design your journals and planner. 60 VIBRANT COLORS CODED WITH NUMBERS FOR FINDING COLORS FAST: This dual brush marker set includes 60 vibrant colors, and each pen is numbered for easier finding your preferred colors. Also, a blank DIY color swatch card is included so that you can edit and organize the colors according to your preferences. BRUSH & FINE, DOUBLE TIPS, DOUBLE CREATIVITY: These dual-tipped adult coloring marker pens are a must-have for your next masterpiece. The 0.4mm fine tip can glide through the details for intricate coloring, writing, and doodling with fluid precision while the 1-2mm soft brush tip flows through the large area art projects for shading, coloring, blending and more.What's more, the fine tip is perfect for take note & coloring in details while the brush tip is easier to create various marks which is perfect for calligraphy and creating interesting pattern to design your journal.