Featuring a single-ply 10-mil ultra white film, Powermax has a free-floating internal muffling ring to focus attack, pitch and lower frequencies. With a 10-mil dampening underlay and a CS dot applied underneath for added strength, the Powermax is the ultimate in Powerful bass with Maximum projection, tone, and control. Discover what champion drum corps, indoor drumlines and top high school and college marching bands have in common. Powermax: the perfect head right out of the box and onto the field. No assembly required.