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 B-250QB 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 adjusable memory lock keeps your settings tight and in check.