This V4 tamper has further improved on the central shaft design, also the interchangeable springs (15lb/ 25lb/ 30lb) are now applicable to the central shaft which provides pressure directly to the coffee grounds. Why NORMCORE Spring-loaded Tamper? Level Tamping - The ingenious design of leveling plate ensures your tamping level every time by resting on top of the filter basket as you press down on ground coffee. Consistent Pressure - The amount of pressure you apply is simply controlled by a pre-calibrated spring inside the tamper itself. Moreover, it comes with 3 interchangeable springs to suit your preference. Depth - Press and turn clockwise at the same time when tamping to create level result. This is the tamper for both aspiring home baristas and busy cafes. The set includes: 1 - Spring Loaded Tamper 1 - Coffee Tamper Stand 1 - 30lb Spring 1 - 25lb Spring（Already installed ） 1 - 15lb Spring