From the introduction:
An entire tribe of crafty, clever kobolds.
Kobolds are a diverse and maddeningly talented lot, when they put their minds to it. Many classic adventures portray their society as having alchemical skills, dragon sorcery, trap experts, ambushers and more.
This sourcebook runs with that premise by presenting ten unique kobold designs - not just the same kobold with different weapons, but those specifically trained and skilled in their abilities and equipment. Also there are two animal companions as a bonus.