The green discs are made for individuals with non-sensitive skin who are comfortable and experienced using the Personal Microderm. Feel the intensity while keeping a moderate level of exfoliation. Replace discs every 3-4 uses. Fits any PMD Personal Microderm Device (not included). Discs are made of aluminum oxide. About Personal Microderm: Personal Microderm uses a patented spinning disc technology to deliver revolutionary microdermabrasion treatments and unmatched, brilliant results. The patented disc spins as it glides across the skin providing brilliant results with each treatment. Personal Microderm allows for complete treatment customization; whether extremely sensitive or precisely intense, there's a perfect disc for every skin type.  Personal Microderm delivers the same brilliant results on your neck, chest, arms, legs, hands, and feet! The large body discs easily cover a greater surface area to more quickly treat the body. Smooth, soften, and brighten your skin from head to toe. 