Lavender is a must have roller for stress relief and relaxation. We use it in a variety of our custom blend rollers. It is a calming oil that is good for the skin, as well. We blend the oil into fractionated coconut oil and fill our beautiful cobalt blue roller bottles. All of our roller tops are stainless steel. We prefer them over plastic due to plastic breaking down eventually and the effect some citrus oils have on plastic. The stainless steel roller ensures a smooth coverage.