What is it: A six-pack of PMD Personal Microderm replacement discs. It includes two small and four large discs in the very sensitive level-for those with delicate skin or those who are beginners with their device and want to go beyond the training disc. Who is it for: Ideal for those who want smooth, even-toned skin. Why is it different: These aluminum oxide crystal discs allow the handheld device to operate by smoothing away dead skin cells. How do I use it: Securely place disc on PMD Personal Microderm Device (not included). Use on your face, elbows, hands, feet. Smaller discs are for the face, larger discs are for hands and feet. From PMD Personal Microderm.