The cold pressing method is mainly used for citrus essential oils, as well as some carrier oils that can be used for dilution or topical application. This method is also known as expression or expeller pressing. Citrus fruits, unlike their plant counterparts, tend to have their essential oils contained in sacks on the underside of the fruit's rind. The whole fruit is placed inside a steel drum, and the sacks are repeatedly punctured until the entire surface of the rind is marked. The fruit is then carefully pressed to squeeze out both the oil and the juice within it.