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 the best level result. This is the perfect 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