With these fantastic color changing magic water cards, you won't have to worry about footprints in your apartment anymore. The set includes 10 reusable cards and a water marker. Just fill the felt-tip pen with water and encourage your child to learn while having fun. Each card contains words, numbers and pictures to be colored. A child can create imaginary shapes and develop motor skills, imagination and creativity. Cards can be used multiple times. They will also work well when traveling.