PMD Replacement Discs come in a variety of options, and can be changed and replaced if your existing discs run out, or if you want to change your microderm regime. Very Sensitive Replacement Discs are grey in colour. They are a great option to maintain smooth, healthy skin without the intensity of coarser discs. Sensitive Replacement Discs are blue in colour. Ideal for someone with sensitive skin who has used the PMD for several treatments and wants to move to an exfoliation level above the Very Sensitive Grey Discs. Medium Replacement Discs are green in colour. They are suited for someone with normal or non-sensitive skin who has used the PMD for several treatments and wants to move to an exfoliation level above the Sensitive Blue Discs. Coarse Replacement Discs are red in colour. The highest level of exfoliation, they are ideal for someone who has normal skin who wants to upgrade from the Medium Green Discs.