After I switched from Nuk soothers on-Mam, but already had cute dummy chains, so had her Adapter rings. The conventional rings (from the drugstore by cheap Schnullerketten) usually do not fit on Mam, they are too big. I have now tried this and I'm thrilled. For they not only fit perfectly, they are also soft and not rigid. This also facilitates the set up and take off when I want to solve the pacifier eg the sleeping child from the chain. As seen in the photos, they are slightly stretched and fit so perfectly. So even an unwanted slipping is excluded. Top product and an absolutely fair price!