Each wick holder includes a 8" round fiberglass wick. Fiberglass wick does not burn away like cotton wick. Paraffin oil is a great oil to use for a nice clean burn. Keep your wick low about 1/8".
Note: ALWAYS MEASURE THE OPENING OF THE WINE BOTTLE THAT YOU HAVE. There are many wine bottles that have different size openings! This is not a cork or a stopper, it is designed to hold the wick in place and sit on top of your bottle with the neck of the wick holder extending down inside of the wine bottle.
To insert the wick into the wick holder, compress one wick end and feed the wick in an upward motion through the bottom of the wick holder until it feeds through the top, then pull through.