World Marketing 20401U KW-11 Replacement Wicks Provides the maximum performance by using the newest technology available Exclusive black top FIBER-GRAPH burning surface has been proven to reduce carbon build-up by as much as 38% over the competition's white top wicks Easier installation by using exact specifications Insures you of correct length, diameter, and thickness for proper fit Superior design combines a smooth furl flow and high temperature burning surface to produce a more complete combustion process