This is a genuine Bialetti spare part set designed for 3 and 4 cup Moka coffee makers. It includes three rubber gaskets and one aluminum filter plate. These replacement parts are compatible with a wide range of Bialetti models including Moka Express, Fiammetta, Break, Happy, Dama, Moka Melody, Alpina, Moka Timer, and Rainbow. The outer diameter of the gaskets is 65mm. Using genuine Bialetti spare parts ensures the quality and continued perfect functioning of your Bialetti coffee maker over time.