These CANDLES in different models are placed in each vessel (glass, cup, saucer, tealight holder, etc.). The vessel is filled with ordinary cooking oil up to the wick. Then it lights up. The burning time depends on the amount of cooking oil / vessel diameter. For example, 20 ml of cooking oil gives about 4 hours of burning time per refill. Fits most vessels. Provides beautiful light and great opportunities for different aesthetic solutions.