[Self-Adjustable Tamping Pressure]There is a built-in 24-35 pound impact regulating valve with special screws inside Tamper. [Sound Feedback]There's a solid "click" when you hit the tamping pressure you set, then the base will squeeze the puck again to reduce the space between the powder puck and eliminate the channelling problem. After the tamping is completed, it will automatically reset without adjustment. [Stainless Steel Ripple Base] Allows the water to be distributed more evenly as it passes through the coffee grounds so that a better coffee can be made. [Horizontal Tamping] The ring above the base ensures that the tamping pressure on the puck is even. Specification: 58mm size: 11.5cm Material: Stainless steel + aluminum alloy colour: Black+silver Package Contents: 1 x Coffee Tamper Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.