These are genuine manufacturer-sourced replacement flavorizer bars that are specially designed for use with Weber grills. The purpose of the bars is to direct grease and drippings away from the burner tubes, this will help to cut down on flare-ups tremendously. An extra benefit of these bars is that they will help to add that smokey flavo...Read morer to your food. Bars would generally rust in the combination of heat and moisture, to ensure the longevity of the new components after each use allow bars to cool down and wash them with warm water and soap. Please note, this set contains five high-quality stainless steel flavorizer bars.