Coloplast Assura® Skin Barrier, Non-Convex, Cut-To-Fit Stoma Opening 3/8″-2-1/8″ (10 MM-55 MM), Flange 2-3/8″ is an ostomy skin barrier designed to help create a secure seal and support confident wear with two-piece, convex barrier profile, cut-to-fit opening, and compatible with Assura. Box of 5.