Discover new ways to color with water on any Melissa & Doug Water WOW! color-reveal activity pad or surface! The chunky water pens and a water sprayer are easy for little hands to hold and have different tips for creating unique fun designs. The standard tips, calligraphy tips, and wide brushes are interchangeable with the reservoirs. A specially designed cap fits any of the pens and includes a stretchy tether that easily attaches to any Water WOW! activity pad's spiral binding (Water WOW! pad not included). Water WOW! arts and crafts are a reusable, mess-free way to color: Activity pages are white when dry, and reveal colors, pictures, and shapes when wet. Let the pages dry to erase, then color with water using the pens or sprayer again and again! Each set includes 4 chunky water pens (2 standard tips, a calligraphy tip, and a wide brush) – 3 with standard-sized reservoirs and 1 extra-large -- and a water sprayer. Sold as 2 complete sets for a total of 8 brushes.