Coloplast Assura® Skin Barrier, Extra Extended Wear, Convex Deep, Pre-Cut Stoma Opening 3/4″ (18 MM), Flange 1-9/16″ (40 is an ostomy skin barrier designed to help create a secure seal and support confident wear with two-piece, convex barrier profile, extended wear wear formulation, and pre-cut opening. Box of 5.