From time to time Curaprox offer short term special versions. This is the legendary Curaprox CS5460 Ultrasoft toothbrush in a two pack and in the Rainbow version. The handles are all mixed colours and the bristles are in various different Curaprox colours. Buying the two pack saves about 30% over buying the brushes one at a time and you get the bonus of having the Special Edition collectibe Rainbow version.
For a limited time.