Quality throughout: 10 years of product selection experience and 7 years of independent research and development, to ensure products are of superior quality. About materials: The materials we use are economical, environmentally friendly, so there is no danger to the skin, you can let the kids play to their heart’s content. Warm tips: Wash your hands and keep your hands clean before playing. IF slime gets dry, it will restore elasticity after adding a few drops of warm water.