The modern and expressive Norbu candle holders are made using a traditional sandcasting process. They are then polished by hand and refined with a matte silver or gold finish. Tiny pin hole bubbles in the material are evidence of this handcrafting process and are part of the special look of the product. Wax should not be removed with a sharp object or an abrasive sponge, as this would scratch the delicate surface. Use warm water and a soft cloth for wiping clean.