This blister pack from Bialetti contains three replacement seals and one replacement aluminium filter suitable for: Bialetti 4 or 3 Cup Moka Express model (Aluminium Espresso Makers). The outer diameter of the seal is 6.3cm/2.5in and the inner diameter is 5.0cm/2.0in. OR Bialetti 1 Cup Moka Express, Dama and Break models (Aluminium Espresso Makers). The outer diameter of the seal is 5.0cm/2.0in and the inner diameter is 3.9cm/1.5in. OR Bialetti 6 Cup Moka Express/Dama/Break models (Aluminium Espresso Makers). The outer diameter of the seal is 7.1cm/2.8in and the inner diameter is 5.5cm/2.2in. OR Bialetti 2 Cup Moka Express, Dama and Mini Express models (Aluminium Espresso Makers). The outer diameter of the seal is 5.6cm/2.2in and the inner diameter is 4.2cm/1.7in. OR Bialetti 9 Cup Moka Express/Dama/Break models (Aluminium Espresso Makers). The outer diameter of the seal is 8.2cm/3.2in and the inner diameter is 6.4cm/2.5in. OR Bialetti 12 Cup Moka Express model (Aluminium Espresso Makers). The seals have an external diameter of 8.9cm/3.5in and an internal diameter of 7.4cm/2.9in with the outer diameter of the filter being 8.1cm/3.2in.