1.57 in DIA, Attachment Head. Visible results in just 1 use. Easy, gentle. 2 month supply. Also works with Neutrogena Healthy Skin Rejuvenator. Specifically designed to work in combination with Neutrogena Microdermabrasion System. Today: Softer, more luminous skin; Tomorrow: Firmer, younger-looking skin. Pre-dosed puffs deliver the perfect degree of gently exfoliation with ultra-fine crystals and mild purifiers. So easy and convenient: Just use 3 times per week in place of your scrub. Dermatologist Clinical Study Proves: Instantly 91% had softer, more luminous skin; 1 week: 88% had visible improvement in the look of fine lines; 4 weeks: 88% had significantly reduced appearance of wrinkles or age spots; 8 weeks: 72% had substantially firmer-looking skin. www.neutrogena.com.