Feature: 1. 【Constant Pressure】Only when the pressure reaches the preset value. It will impact filling and pressing to make the powder more compact and uniform. Effectively reduce channel effect. The metal ripple bottom increases the contact surface between water and coffee grounds, improving the extraction effect. 2. 【Innovative 4 Spring Design】This 51mm coffee tamper features 4 spring system for precise tamping. Maintain constant pressure, prevent over-compaction, achieve evenly powder compaction, provide pressure adjustment, easy and convenient to use. 3. 【25-35LB Adjustable】Built-in 25-35lb impact valve, remove the top cover and rotate the adjustable ring to easily adjust the impact force. Easy for making different coffee and satisfy different needs. 4. 【Ergonomic Handle】The handle of coffee tamper with ergonomic design for smooth and comfortable grip. The top adopts anti-slip stripes, ensuring maximum comfort during use. Easy to clean and maintain. Ideal for coffee lover and beginner. 5. 【Premium Material】The aluminum body is delicate, wear and corrosion resistant. Food grade 304 stainless steel ripple base is safe and odorless. work seamlessly with a variety of 51mm portafilters and brew baskets. Specification: Specification: Base Size: 51mm/2.01mm Base: Ripple base Main Material: 304 stainless steel+Aluminum Alloy Product size: 51*97mm/2.01*3.82in Product weight: 286g/10.08oz Package List: Packing List: 1 * Coffee tamper