CONVEX All-Flexible Mounting Rings • For persons with fleshier abdomens and short or flush stomas. The 1/4" (6mm) convexity applies slight pressure to the stomal area, allowing the stoma to stay within the mounting ring opening and not retract Petite Convex • For the small person with soft abdomen or with a stoma in a hard-to-fit area, close to the rib cage or hips. 3-3/4" x 2-7/8" (9.5cm x 7.3cm) Part No. GN-42 Green Neoprene Rubber