Coloplast Assura® Skin Barrier, Extra Extended Wear, Convex Deep, Pre-Cut Stoma Opening 1-1/8″ (28 MM), Flange 2″ (50 MM) 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.