This Bialetti 9 Cup Washer/Filter Set is a genuine Bialetti spare part. Compatible with the Moka Express, Dama and Break, this set includes three washers and one filter. Outer diameter: 80mm. With continuous use, the rubber seal on the filter plate in your coffee pot will need to be replaced. Keep your Bialetti coffee maker in top condition with these essential replacement parts. This set is designed to ensure optimal performance and longevity of your Moka pot.