Necessary Replacement Part for Breville coffee makers, help to create a tight and secure seal that ensures no moisture escapes,safe and not deformed,will not crack, or leak.Exact Fit - using in specific Breville models which using 54mm portafilter including models 878/870/870XL/860/840/810/500/450 and so on, also work well in other espresso machine with the 58mm diameter such as Sage 500/870/875/880/810/878.Silicone group head gasket is made of food grade silicone, BPA free, easy to remove and install.Silicone replacement gasket seals are a must in life and in the kitchen, and any set of gaskets needs to be replaced, so having a spare steam ring on hand for coffee lovers is a must.Package including: 2 pcs 58mm Breville Espresso Machine Brew Group Head Seal Gasket.