Our 51-32-18 zinc core wicks are a great choice for a wide range of different candle making creations. These zinc core wicks are 7 inches long with a 20mm tab and a neck height of 3mm. They come pre-cut, pre-waxed, and pre-tabbed for your convenience. Zinc core wicks are cool burning and made by using natural fibers in the cover with a zinc core to provide maximum rigidity and strength. This helps to keep the wick straight in melted wax.