Melissa & Doug On the Go Water Wow! Reusable Water-Reveal Activity Pad - Vehicles Four fun activity/coloring vehicle-themed board books, each with refillable water pen Reusable white pages feature simple line drawings when dry; filled with color when wet Chunky-size water pen for easy filling, easy gripping Compact, spiral-bound format that's great for travel Promotes fine motor skills, early writing skills, and visual discrimination