This comb is perfectly sized for rabbits (and other small animals). This tool is great for both short and long haired bunnies. The coarse teeth remove mats and tangles and fine teeth smooth detangled hair.
This guide by The House Rabbit Society, explains how to groom a rabbit. It is important to brush a bunny regularly to stop them from ingesting fur. Unlike cats rabbits cannot throw up hairballs, instead, they can create a painful and possibly fatal blockage.