The structure and chamber are made of AISI 304 stainless steel; the convex lid is of a greater than standard thickness and strength: it will not bend. The bag sealing system with cut-off guarantees a strong, even seal and maximum resistance of the package to internal stresses and temperature changes. The dimensions of the sealing bar are tailored to the most commonly used packages and working methods observed in the course of many years of work and specific experience, so as to ensure optimal use of the machine. All the machines making up the PACK range are equipped with programs enabling users to memorise sealing times as well as the percentage of vacuum or of gas and to choose among 9 extra-vacuum options.