The model boxes, type round, facilitates the discharge of materials more dense (mainly in the corners), offers a better resistance to wear.
The round tippers model FOREVER IV are manufactured on the basis of plate wear, high hardness (400-450HB) that suffers quinagens multiple to give you the rounded.
The body type monocoque is composed of a background plate, two side plates and a sheet of easel whose thickness can vary between 3,2mm and 10mm depending on the choice of the client.