All of our jar candles are made with the perfect paraffin container wax. It holds the maximum amount of fragrance possible, making these candles very strong and long lasting. This unique wax also burns cleanly, completely and evenly with no leftover wax along the sides of the jar. Each jar candle also have a UV inhibitor added to keep their color from fading. However we recommend not placing your candle in direct sunlight to preserve it better. The wicks are a specialty braided flat cotton wick which maintains a slight curl when burning. The curl moves the tip of the wick into the hottest part of the flame, which helps to minimize or eliminate mushrooming, reduce smoke, and provide a self-trimming effect. This creates a very stable and consistent flame. Be sure to trim your wick to 1/4 inch before each lighting. Doing so will keep your candle burning clean, with no black smoke. Our wicks are also lead, zinc, and metal free.