Our fiberglass wick is by far the most popular wick used in oil candle making today. Specially designed so the fiberglass does not fray easily, our fiberglass wick is among the most popular wick with oil candle artisans. Fiberglass wick will outlast cotton wicks and do not burn away like cotton. Our fiberglass wick measurments are approximate and they will expand some. The fiberglass wicks are used in designer oil candles and lamps and even in outdoor torches.