Each candle comes with a built in plastic oil well that holds 4 to 5 continuous hours of oil.  The wick supplied is fiberglass and is designed to be used with a smokeless lamp oil.  An instructional sheet will be included with the order, please read and follow these instructions.  Remember, never leave a burning candle unsupervised, around children or pets and flammable materials.  Please direct all questions or comments using the Contact Us function.  Thank you, and happy shopping.