The products must have characteristics of absolute quality in terms of repeatability and aesthetic aspects as the dimensional tolerances accepted by these productions are really tight. In the long run, the manufacture of product with poor quality content would be in fact an economic loss, since some products offer a limited margin that can be justified only with large production volumes. In the so-called fast molding it is then preferred the use of 48/64 multi-cavity molds, able to ensure, thanks to the fast molding cycles, a high production rate.