This is a reusable educational toy that changes color when drawn with water ^o^♡ No need to worry about getting clothes dirty, so it's perfect for going out ( •̤ᴗ•̤ ) The pens can be refilled with water many times, so you can use them anywhere as long as you have water♡ It's a convenient size to carry around, so it's also suitable for use in the car or in places where you want quiet ^o^ It also helps with concentration and is perfect for children who love to color ^o^ It can be used many times, so it's very convenient♡ Available designs: The animals in the second photo ^o^ Pen colors are random! This is the price for one book ^o^ Thank you for looking! Please see my profile ^ ^