1. quality materials: Our espresso machine seals are made from foodgrade silicone that is temperature resistant, wearresistant, and BPA. Through strict quality control and production processes, the coffee machine seal set can withstand temperatures ranging from 65°F (54°C) to 450°F (230°C), extending the lifespan of your coffee machine. 2. sealing technology: Our sealing rings, compatible with Sage The Barista Express, feature a unique Oring seal design. The Oring fits snugly into the grooves of the Breville/Sage coffee machine, creating a strong seal that effectively prevents leaks. This keeps your coffee machine and surroundings clean during the brewing process. 3. Efficient cleaning guarantee: Our 54mm silicone steam ring, compatible with Sage Barista Express, contains no harmful elements and effectively inhibits bacterial growth inside the coffee machine. This ensures that every cup of coffee is clean. The 54mm silicone steam ring guarantees the taste and quality in every brew. 4. Wide compatibility: With our 54mm silicone steam ring, you can enjoy your favorite coffee in comfort. The coffee machine seal set is compatible with Breville 870, 878, 880, 860, 840, 810, 450, 500, as well as Sage 500, 810, 870, 875, 878, and 880 espresso machines.