"Duplex boxes" are a type of packaging box made from duplex board, which is a kind of paperboard with a double layer (hence "duplex"). These boxes are commonly used in packaging due to their strength and good surface finish, making them ideal for printing and branding.

Types of Duplex Board (based on the back side): 1. White back – higher quality, used for premium packaging 2. Grey back – more economical, used for general packaging