Zinc core wicking for Gel candles
This wick is a cotton outer braid surrounding a thin filament of zinc which gives the wick stability.
For the most part the rule of thumb with gel candles is “one size up”. Since gel candles burn so much slower, you need to increase the size of your wick by about one size from what you would traditionally use in a wax candle. Unprimed wick avoids the wax shadow around the wick in finished candles.