Coloplast Assura® Skin Barrier, Extra Extended Wear, Convex Light, Pre-Cut Stoma Opening 7/8″ (21 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, light convex barrier profile, extended wear wear formulation, and pre-cut opening. Box of 5.