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 or 870 or 870XL or 860 or 840 or 810 or 500 or 450 and so on, also work well in other espresso machine with the 58mm diameter such as Sage 500 or 870 or 875 or 880 or 810 or 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.