Sound Feedback: Since the tamping force of ordinary espresso tampers is different each time, we designed a new concept of constant force tampers after repeated testing, when the pressure reaches a preset value, feedback is provided through the mechanical sound of the press rod and the tamper seat. Constant Pressure: This 58mm tamper is designed with 3 springs to maintain a constant pressure of 30 pounds without adjustment for even tamping. It has been tested with 30 pounds of constant force, which helps improve the flavor and stability of espresso coffee when extracted. We also offer a 15 pound spare spring that is perfectly suited to your tamping needs. Automatic Rebound Spring: This espresso tamper 58mm is automatically adapted to the required compaction height and maximum compaction depth up to 13mm. The use of horizontal constant pressure to prevent pressure bias, bakket and filter closely fit, tamping experience more comfortable. After tamping, the spring returns the structure to its original position. Ergonomic Handle Design: The espresso hand tamper features a round, solid wood handle that offers a comfortable grip and easy handling. Its ergonomic design ensures a more comfortable tamping experience, while the elegant combination of wood and metal adds a refined, stylish touch. 49.7mm Base: This hand tamper is made specifically fit for ROK Espresso Maker GC Tamper and ROK Presso Espresso Makers. MHW-3BOMBER Espresso Tamper 49.7mm with 3-Spring Loaded, Calibrated Coffee Tamper 30lbs, Tamper for Espresso Machine with Sound Feedback T7069F-OS