A great starting point for sensitive to normal skin types. Also ideal for use on the decollete and body. An all-around brush head for most skin types.All CLARISONIC brush heads are made from a nonporous, soft elastomeric material, resistant to bacterial attachment. All brush heads are precision-designed to oscillate bi-directionally at a sonic frequency. It is recommended that you remove the brush head weekly and clean with soap and warm water. Replace your CLARISONIC brush head every 90 days.How to use: To mount the brush head, align the three notches with the three pins on the handle, then push down and twist clockwise. Brand: Clarisonic. Style Name: CLARISONIC Replacement Brush Heads for Sensitive to Normal Skin (4-Pack) ($100 Value). Style Number: 656311.