The rainbow colour-coding makes it easier for you to select the right carpule needles and improves safety during use.
The SOPIRA colour-coding is correspondent to the wavelengths of visible light and its colour spectrum: The longer the wavelength of the labelling colour, the longer the injection needle.
The indications listed are general recommendations. However, specific anatomical particularities must be taken into consideration by the dentist when selecting the cross-section and length of the needle.