Material: Candle wicks are pre-coated with paraffin wax, made of natural cotton thread, free of lead, zinc, and other metals. Smokeless and odorless: Well made, produces no black smoke or smell, burns steadily when lit. Easy to cut: Wicks can be easily trimmed to desired length; smooth and durable, will not break, suitable for candle making and DIY candle projects. Application: Simply attach the wick to the bottom of the container and center it using a wick centering tool while pouring wax. Features and performance: Well constructed, no black smoke or unpleasant odor, burns evenly. Detailed data: Natural white cotton, 20 cm in length; includes wick base of 0.79 inch (2 cm); wick centering device measures 9.5 cm in length. Note: 1. Due to differences in monitor displays, the image may not reflect the actual color of the item. 2. Due to manual measurement, there may be a 1-2 mm variation.