The compartmentation is made of plywood.
Used to hold vertical products upright. The version with 9 compartments for a MPB.b80 pallet box is often used by recycling companies and municipalities for the safe collection of fluorecent lamps.
When using with 2 or 4 compartments in a lower model box, the compartmentation can also be used to keep goods separated. For instance when using the box as a shop display for more than one product.