Coloplast Assura® Skin Barrier, Extra Extended Wear, Non-Convex, Pre-Cut Stoma Opening 1-3/4″ (45 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, extended wear wear formulation, and pre-cut opening. Box of 5.