REUSABLE: Pages that fill with vibrant color when wet and naturally disappear after 5-10 minutes later dry, kids can draw and play again. The reuseful fun water drawing book are not a single-use item. EASY TO USE: water pen is simple to fill and use and is designed with grooves so it is easy for your little one to grip. The spiral-bound format of the doodle boards makes it convenient to carry. IDEAL GIFT SET: yuen water coloring doodle book is the perfect gifts for age 3+ children to keep entertained at home or on the go, to enjoy the early education by parent-child time. SAFE & DURABLE: Non-toxic water painting book is safe for kids to enjoy drawing without ink which makes mess free away