Which size openings are suitable for firm skin on very low levels of vacuum?

The choice of 5 cm openings for firm skin when using very low levels of vacuum is appropriate because larger openings provide a broader surface area for suction, which can effectively stimulate circulation and promote lymphatic drainage without causing excessive pressure. This is particularly important for firm skin, where the texture and structure may not require aggressive treatment.

Using firmer, thicker skin to their advantage, the medium size of the openings allows for a balance between effective stimulation and comfort. The 5 cm size is ideally suited for clients with firmer skin, as it can help avoid any potential adverse reactions caused by either too much suction or too little stimulation.

Smaller or narrow openings would typically be more effective for sensitive or thinner skin types, where lower suction force is required to minimize discomfort and avoid damage. Larger sizes might also induce too much suction, which could be uncomfortable or counterproductive. Thus, the 5 cm openings provide a strategic choice for firm skin with low vacuum levels, allowing for adequate treatment without excessive force.