This grooming tool from Coastal Pet Products removes stubborn mats easily with (caution blades are extremely sharp!) serrated stainless steel blades.  Perfect for dogs with wiry, coarse or long, matted coats.  The comb can be used on either medium and long haired dogs.  Features a comfortable handle and thumb rest (metal piece above blades) for gripping. The comb teeth are sharp (to easily work through matts) and can cut easily.  One size.