Cymed MicroDerm Plus - Washer Ostomy Rings is a skin barrier that offers additional peristomal skin protection. MicroDerm stoma seals are pectin-based skin barriers. Ideal for use under an ostomy wafer. Helps prevent prestomial skin breakdown by stopping the skin around the stoma from coming into contact with stomal output. Size: 7/8", 1", 1 1/8". Box of 30.