MD® Barber alum block acts as an aftershave and deodorizer. Block measures approx. 2 x 2 x 1.75" and weighs 3.3oz. Features an debossed MD® logo on surface. An alum block is a crystal-like stone that is moistened with cold water and gently rubbed over the shaved area to act as an antiseptic and to combat razor burn. It can also help to stop bleeding from small nicks and cuts.