The Melissa & Doug On the Go Water Wow Activity Pad 3-Pack includes three themed watercolor books: Colors & Shapes, Fairy Tale, and Animals. Each book contains four reusable white pages that reveal hidden colors and pictures when filled in with the included refillable water pen. Once dry, the pages reset for repeated use. The chunky-sized water pen is designed for easy handling by small hands, and the spiral-bound format makes it travel-friendly. This set is suitable for children ages 3 to 7 and pairs well with other Melissa & Doug reusable activity products. The brand has been recognized for its focus on imaginative, screen-free play for over three decades.