These reinforcement elements are designed to increase sidewall strength and are produced by scoring according to the internal dimensions of the box. When placed inside the box during application, they prevent deformation of the form and protect against pressures that may occur during transportation.

Since the flute direction is designed to run parallel to the slotter scores, load distribution is balanced and stacking strength increases significantly. They are especially preferred in packaging used for transporting multi-layered or heavy products, providing structural durability.