Coloplast Assura® Skin Barrier, Extra Extended Wear, Non-Convex, Cut-To-Fit Stoma Opening 3/8″-1-3/4″ (10 MM-45 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 cut-to-fit opening. Box of 5.