Cymed MicroDerm Plus - Washer Ostomy Rings/Seals (Cut to Fit) provide extra protection and support to the skin around the stoma. MicroDerm stoma seals are pectin-based skin barriers. The plus washers are twice the density of the standard MicroDerm washer. These ostomy supplies are used in conjunction with an ostomy pouch system to aid in the prevention of prestomial skin breakdown from either urine or feces. Cymed washers work with all types of ostomies.