The most commonly used birthday candles are cylindrical and long taper candles. The base diameter is about 3/16”. They are made by dipping wicks into some melted wax. Wax is poured into a mold and then rolled around a wick.
There are some very imaginative and innovative styles of birthday candles available on the market. There are even edible candles that are made with soybean oil. There are also floating and aromatic candles that are used for birthdays for older people.
Blowing birthday candles out will always be a cherished tradition.