Discover new ways to color on any Melissa & Doug Water Wow! activity pad or surface (pads sold separately). The set includes 4 refillable, chunky water pens—each with interchangeable tips (standard, calligraphy, and wide brush)—plus a pump‑style sprayer for bigger color‑fill areas. Kids can create different lines, strokes, and designs while enjoying mess‑free, reusable coloring fun.