Aj is short for Air Jordan. Generally, Putian produces high imitation or low imitation. The quality of high imitation is ok, and it can be worn for more than half a year to one year. If it is low imitation, give up treatment. Authentic products generally look at styles. AJ4, such as gray-green or knight, is the cheapest and can be ignored if it is below 800,800. There are usually defects or fakes.