This modelling clay is a wax-based dough that becomes soft and malleable, and can be reused as it does not dry. Colours can be mixed to create new tones. Must be kept away from heat sources, and protect clothes and furnishings. Light stains can be removed with soap and water, while heavier stains can be removed with olive oil, soap and water. Each bar colour is 0.63 oz. Recommended for ages 3 and up.