The 12-pack of Durgol 'Swiss' Espresso Descaler is designed for use with all brands of espresso machines. Each bottle contains 4.2 fluid ounces of the descaling solution. This product helps to effectively remove mineral build-up and limescale from your espresso maker, ensuring optimal performance and extending its lifespan. The package dimensions are 12.56 x 10.91 x 6.65 inches, and it weighs 7.45 pounds. The black color of the bottles adds a sleek touch to your coffee accessories collection. This descaler is a convenient solution for maintaining your espresso machine regularly.