The original four-surface beater, the Pearl Quad Beater delivers the ultimate in sonic and bass drum performance versatility. Providing four different beater surfaces, the B250QB lets you choose from two hard plastic surfaces or 2 felt surfaces. For pinpoint accuracy or line head contact, each offers its own distinct sound and feel. Furthermore, its Control Core elastomer core absorbs vibration on impact for a more controlled, comfortable stroke. Finally, an included adjustable memory lock keeps your settings tight and in check.