I bought two packs of different colours so I'm posting the same review for both. The one thing I don't like is that there is a similar blue in both packs. This was a problem for us as I wanted one pack to be for one child and the other for the other. We wanted to be able to tell at a glance whose was whose but couldn't so ended up writing their initial on them.
This is the third type of bamboo brush we've tried for the kids. On the others, the youngest chewed the bristles out very quickly and had them in his mouth - very worrying. He still gave these a good chew but none have come out and the brushes have lasted a reasonable time (shorter for him than his bigger brother). The heads are a good size for their little mouths and they are (more!) happy to have their teeth done.
We did originally stand the brushes in a glass jar and the colour started to come off the end. This was our mistake but worth noting that it's just a coating.