Bialetti:Replacement Rubber Seal for 6 Cup Venus/Stainless Steel Espresso Makers - Loose Packed bialetti replacement rubber seal/ring/gasket suitable for 6 cup venus musa mia and kitty stainless steel espresso makers. outer diameter 7.3cm/2.9in - inner diameter is 5.7cm/2.2in. loose packed. cup size is based on espresso cup sizes and not on regular tea or coffee cup sizes.