Chris Christensen Pin Brush
www.chrissystems.com
Actually, I got the 27mm pocket size fusion brush and am very happy with it.
I do also have a lepooch brush that I use just for mats because it does pull some hair but if the mats are really bad, it is good. Just be sure to hold the hair next to their skin so that if you are pulling at all, it is just hair and not their skin.