Trendy, Handcrafted, Soapstone oil warmer, for Home Decor, Hotels, Festival, can use any aromatic oil. Easy to maintain. Size 3*4" An oil warmer is a receptacle that holds a candle heating element that sits under a bowl or basin of water. Drops of any aroma oils added to the water disperse in the room as the water evaporates due to the heat. Soapstone Characteristics & Properties: Soft and very easy to carve, nonporous, nonabsorbent, low electrical conductivity, heat resistant, high specific heat capacity, resistant to acids and alkalis, hence long lasting.