These espresso filter baskets are designed for use with Breville espresso machines with a 54mm group head such as the Barista Express, Barista Pro or Barista Touch. They are specifically suited to fit the bottomless portafilter for your Breville espresso machine that we have available on the site. They are effectively double shot baskets, though the exact amount of coffee you can fit will depend on the specific bean or blend that you are using.