I use these seals after I modify them. Since the skin around my stoma is reasonably flat I'm told I don't need these rings and to just use the 2-piece Convatec Moldable wafer system. I probably will in time. For now though, I buy the rings, cut them in thirds, roll each third between my palms until it's about 3 and a-half inches long, make a circle about an inch in diameter, flatten each to about a sixteenth of an inch then apply one around the stoma after using the Cavilon barrier film and before I apply the wafer. Sorry for the very long sentence. Please tell me and I'll rewrite it more clearly if needed. With this method I never had a leak in my nearly nine stoma years. (I'm now knocking on any piece of wood in reach.) So I get 150 seals from a box of 50 and I probably do three times as much work as needed but I'm too chicken to change anything.
Storing them for the next change is another consideration we can discuss.
Respectfully,
Mike