Oolong teas are partially oxidized teas and undergo the most difficult and time-consuming processing method. There are five steps when making: withering, making (or shaking) fixation, (stirring) baking fixation, rolling and drying up, two other steps at the beginning compared with making green tea. Therefore, they are key processes when forming the special characteristics of oolong tea. After withering, the tea leaves are put in a rocking machine; or for high quality tea in a bamboo basket. Making fixation is achieved by shaking the leaves. Some parts of the leaves would crash, enzyme released. After a series of biochemical changes, semi-fermented level is reached.