1. A convex shell for use in a base plate of an ostomy appliance, the convex shell comprising an annular ring defined by an outer edge and an inner edge defining a through-going hole, said ring having a higher flexibility around a first axis which is perpendicular to the centre axis of the through-going hole relative to the flexibility around a second axis having an angle to the first axis and being perpendicular to the centre axis of the through-going hole.
