Steel Balls for Full Immersion: The bottom of the coffee dripper is equipped with steel balls that effectively block and control water . This structure allows the coffee grounds to be fully soaked before dripping starts, improving extraction uniformity and helping release richer aroma and balanced flavors in every cup of coffee. Interesting Craters: During extraction, the filtered coffee grounds naturally form complete -like rings along the inner wall of the cup, creating a visually engaging brewing process. This interesting effect makes manual brewing more enjoyable while helping you observe extraction status more intuitively. Stable High Borosilicate Glass Filter Cup: The filter cup is made of high borosilicate glass, known for its clarity and resistance to temperature changes. It adopts a tightly linked design with the base to enhance friction, helping prevent slipping, shaking, or accidental falling off during brewing for a more secure experience. Easy to Operate Switch Valve: The coffee cup holder features a built-in button switch valve, designed for intuitive one-handed control. Push the button upward to close the valve and extend immersion, push it downward to open the valve and dripping, allowing you to fine-tune extraction time and coffee strength effortlessly. Detachable and Versatile for Multiple Methods: The coffee filter can be easily detached from the base for thorough cleaning, helping maintain hygiene and taste. It can be used with a variety of compatible bases, making it suitable for both immersion brewing and traditional hand drip extraction to meet different brewing preferences.