Nuk Plastic Teether Set 2 PCCooling Teething Ring Set The NUK Cooling Teething Ring Set, which is suitable for children aged 3 12 months, offers twice the relief during teething. It features 2 x interconnecting rings; a cooling ring that can be chilled in the fridge to provide a gentle massage for sore gums and a firmer ring that intensively massages your child's gums. As well as providing relief during teething, the different colours, surfaces and interconnecting design of the