Flat Wicks for Most Oil Lamps. High grade cotton for a clean burn and fast fuel exchange. 3/8" wide, 6" to 8" long. Comes in packs of 10.. 3/8" wide: Known as #00 Size. Fits Acorn, Hornet and Nutmeg Burners. Cotton wick replacements for oil lamps and lanterns. See description for measuring details . Need help figuring out which wick to use? Turn your burner over and measure the width of the wick channel.