Features: Premium food grade silicone sealing rings for ensure heat resistant durability (up to 3000+ cycles) and leak proof performances in coffee machines like 878, 870, and 880 models. Precisions engineered 54mm silicone rings features smooth surfaces for effortless cleaning and maintains optimal pressure during espresso extraction, outperforming standard rubber seals. Ideal for coffee enthusiasts and professional baristas needing reliable replacement parts to restore original grade sealing in BES840XL, Infuser BES840, or Barista Touch BES880BSS machines. Perfectly seals portafilters during daily espresso brewing for home, offices, or cafes, preventing steam leakage while enhancing crema consistency in coffee shots. This 2 pack silicone seal set extends coffee machine lifespan by replacing worn out rings that cause pressure loss, ensuring compatibility with 54mm group heads across 20+ models. Specifications: Material: Silicone Size: As Picture Shows Package Includes: 2x Coffee Machine Gasket note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.