The Small Extra isn't small; it's just a little smaller than the Large Extra. The "Extra" in the model name refers its extra-stiff grade boar bristles. Best suited for medium-long hair of thin to average density. 7 rings of stiffer-grade pure boar bristle tufts Each tuft contains bristles cut in 2 lengths Shorter bristles focus on cleaning and polishing the hair cuticle Longer "spired" bristles collect and distribute natural oils that add body and shine. Pneumatic rubber cushion regulates the penetration of each tuft to effectively condition the hair and scalp. Overall size is 8 7/8 by 2 3/4 inches. Special cleaning brush included.