The Mercury water balls provide intelligent, self-regulating irrigation, ensuring that plants receive the right amount of water. Simply fill the spheres with water, insert the long stem into the soil and as the soil dries, the vacuum inside the sphere releases water to the roots of the plant. The set of two spheres is made entirely of glass and is characterised by its organic shape, which combines durability with refined elegance. They make an excellent gift and combine functionality with style.