ECO-6 wicks are designed specifically for natural waxes like soy wax. They provide a controlled curling of the wick making the ECO series self-trimming, which results in minimized mushrooming, soot and smoke. The ECO-6 wicks come 6 inch inches long with a 20mm base and 6mm neck, 10 to a pack. Primed with High Temp Natural wax. For 2 1/2 inches - 2 3/4 inches Diameter Containers & Votive candles. Also could be used for multi wicks larger container. They work great for soy wax candles.