Tea lights are a staple in the world of candles. These cups allow you to make tea lights easily and perfectly each time. Simply pour the melted wax into the cup and as it cools, and just before it skims over, insert a Pre-assembled Wick . If you insert the wick while the wax is too hot it may melt the wax coating on the wick and it will "slump". If you are going to place the tea light in a closed container be sure to use the metal cups. The container may trap too much heat from the candle which will melt the plastic cup.