SPECIFICATIONS Brand Name: MHW-3BOMBER CN: Sichuan Feature 1: 51/53.35/58.35mm Coffee Distributor Feature 2: 51/53.35/58.35mm Ripple Espresso Tamper Feature 3: Tamping Mat and Brush Set Feature 4: Professional Home Barista Accessorie High-concerned chemical: none Material: Stainless Steel,SUS304, Aluminum Alloy Origin: Mainland China Tamper Base Type: ripple Built-in Dual Spring Structure: Equipped with a pressure-based spring mechanism to ensure stable pressure output and prevent tilting.Features a level and consistent design, making tamping easy for beginners. Spring Reset Function: After tamping, the spring resets automatically using rebound force, ensuring smooth and continuous operation. Leveling Support Spring: Designed for automatic reset to prevent tilting during tamping, ensuring a flat and even coffee bed. Spring-Activated and Automatic Rebound: The spring compresses during tamping and rebounds automatically when released, enhancing user convenience. Precise Tamping Depth: The tamping depth is approximately 23mm, suitable for a variety of coffee-making needs.