Microcannulas are available in various thicknesses, ranging from 18G to 33G, according to the ISO 9626 standard (Table 1). Some companies follow an international specific color standard, allowing the identification according to a world standard (ISO 6009) 9, 10 (Table 2 and 3).
Currently, the lengths available for each gauge vary according to the manufacturer, the vast majority between 25mm and 90mm. It is important to note that cannulas with greater gauges can bear longer rods. The choice of the length of the cannula should be based on the empirical experience of the dermatologist, taking into account the technique used and the area to be filled.1