- 51mm magnetic dosing ring, designed to improve precision in espresso coffee preparation - Compatible with 51mm portafilters, facilitates dosing and prevents ground coffee dispersion - Made of high-quality aluminum alloy, resistant to corrosion and wear - Helps save ground coffee and keeps the workspace clean - Improves water flow and extraction, resulting in a creamier and richer espresso - Easy to place, use, and clean, ideal for professional baristas and home use - Essential accessory to optimize the coffee preparation experience