It's heavy duty and plus calibrated spring designed for a professional and the coffee expert , novice or home espresso maker. the bottom of the tamper distributes, compress and level ground coffee well for a denser, richer and more flavorful espresso brew Made of 100% food-safe grade stainless steel for the tamper base. Compared with other cheaper espresso tamper machines, this stainless steel base tamper is a sturdy and healthy tamper tool for Baristas. The handle of coffee hand tamper is and rust-proof design. This calibrated tamper provides 8kgs of optimal mashing power. By using this espresso tamper, you get a flat concentric ring pattern in your portafilter. After tested, a concentric ring ground espresso coffee obtained . 8kgs strength then produces a better quality, and the consistency of 8kgs of pressure bring a great tasting coffee experience to you, let you like to date with it every day.