The Cool Relax Cooling Rings have been designed for massaging and cooling baby'S gums during the delicate period of teething. The part in soft plastic contains sterilized water, which remain cold for a long time, relieving pain and refreshing baby'S mouth and sensitive gums. The reliefs on the surface make the cooling ring pleasant to chew for the baby, while the handle in rigid rubber allows the child to hold the ring, whilst offering another soft surface to chew. The Soft Relax Teething Rings are made of both soft, natural rubber. The reliefs on the surface make the teething rings pleasant to chew, giving relief to inflamed gums