No chemicals no running costs these sleek stainless steel vessels are an eco friendly cost free way to counteract the dry air created by central heating which can cause dry eyes dry skin conditions and tickly coughs simply fill them with tap water and hang over your radiator the warmth causes the water to slowly evaporate back into the air and you can even add a few drops of your favourite aromatic oilpack of 2 stainless steel humidifiershanging hooks includedprotective rubber bumpers av