This is a replacement vision burner or surface burner head for your gas range. It is silver in color and approximately 4.5 inches in diameter. This burner is sold individually. The burner head distributes gas to create an even flame across the cooking area. If you notice that your food is not cooking evenly, or you are not getting an evenly distributed flame, you may need to replace the burner. The burner is located beneath the burner cap, below the grate. To remove the burner, simply remove the grate and the burner cap, then lift the burner head out. Replace it with the new burner, and reinstall the cap and grate. This is an OEM part sourced directly from the manufacturer.