Stoma size: 1-1/8 – 1-3/8 inches (28 – 34 mm). Diameter: 1¼ inches (32 mm). Thickness: Thin (2.5 mm). Polymer formulation protects against leakage and protects the skin, thereby providing dual protection.. It is easy to shape so it fits snugly around the stoma and can be applied over the skin with dips, creases and folds.. When it's time to remove your barrier, the seal can be removed easily and cleanly, together with the barrier, leaving minimal residue behind..