Concrete base is reusable as a air plant holders or incense cone burn holder after the main pillar candle has burnt away Each candle is handmade from scratch and small imperfections may appear, even though we give our best to deliver the best products. We made our base with a concrete mix, used soy wax, which is a eco friendly renewable resource and cleans with soap and warm water. Our candles are designed for decorative purposes, but they can be burned. Wax drip is expected due to their shape and size, so please make sure you burn them on top of a tray or dish to catch any wax spillage. If the candles drip to much, extinguish and let them cool before using again.