This professional stone heating unit is designed to be a very important part of hot stone massage treatment. the heater pan quickly warms stones to the typical operating range. the easy to use dial control allows for fine tuning of the temperature setting. a free additional spoon is included to remove the stones from the water. the heater is made of stainless steel, and the lid is made from aluminum, which makes it long lasting, rust free, and over all efficient set contains: this professional stone heating unit is designed to be a very important part of hot stone massage treatment. the heater pan quickly warms stones to the typical operating range. the easy to use dial control allows for fine tuning of the temperature setting. a free additional spoon is included to remove the stones from the water. the heater is made of stainless steel, and the lid is made from aluminum, which makes it long lasting, rust free, and over all efficient