Avoid Mess:The espresso ring helps to keep the coffee machine and table clean. Magnetic Adsorption: magnetic design of the powder ring, strong adsorption, safe and durable. Electroplating Process: 51 mm Italian coffee powder ring, with electroplating process, exquisite appearance. Dosage Preparation: The coffee coupling ring helps to measure the ground coffee in preparation for pressing. Avoid Waste: The coffee machine powder ring prevents the wading of coffee powder.