The RUKEN Bowling Ball Foam Cleaner is a foam-type cleaner developed by a cosmetics manufacturer in its own factory that is gentle to both your hands and the ball. They are USBC certified for use in official matches worldwide. The refill version has 10% more volume than the regular product, making it a great value. The low-molecular-weight foam, made from natural ingredients such as coconut oil and carrot leaf extract produced in Japan, gently blend with the entire ball to remove dirt and oil accumulated from daily play. It helps restore ball sharpness and pin action. This product is not only gentle on your hands, bowling balls, and the environment, but also has a sterilizing effect. We hope you will continue to love bowling for a long time; we will bring you a richer bowling life.