The shape of a tube changes the perception of furniture components, especially when talking about chairs or tables. When people think about tubes, the first image that comes to mind is the cylindrical or round shape, being the most used one. In the last years, a desire for innovation and change has led designers and manufacturers to opt for more special shapes, such as the triangle, the trapezoid, or the hexagon. In addition to these geometric shapes, more people opt for other customized forms not available in ironworks or warehouses. This choice allows giving a touch of uniqueness to the final product, differentiating it and making it immediately recognizable on the market.