What it is: A duo of replaceable brush heads that are gentle enough for everyday use, offering cleansing solutions for every skin type. What it does: Perfect for exfoliating skin, shaving prep, and for use on the décolleté and body, these brush heads do it all. The normal brush head provides an invigorating cleanse for normal to oily skin and is ideal for men to prepare skin for an extra smooth shave. The sensitive brush head is ideal for most skin types, including sensitive or combination skin, while the delicate brush head is ideal for delicate, compromised skin without dryness. The acne brush head features extra-plush bristle gradation to provide an ultragentle cleanse for acne-prone skin. The deep pore brush head is engineered with graduated dual-action bristles to flush out oil and debris in clogged pores for a super smooth finish. For optimal results, brush heads should be replaced every three months. This set contains: 2 x brush heads. What else you need to know: All CLARISONIC® brush heads are made from a soft, non-porous material, resistant to bacterial attachment, and are precision-designed to oscillate more than 300 movements per second. We cannot guarantee the efficacy, durability, or long term impact on the device itself, of brush heads not engineered by Clarisonic.