The tamper looks like a simple accessory, but it plays a direct role in espresso quality: it presses the ground coffee into a uniform puck, through which water flows in a controlled way, at constant pressure.
Why even tamping matters
If the coffee puck isn't tamped evenly, water finds the path of least resistance through the less dense areas -- a phenomenon called channeling. The result is uneven extraction: some areas over-extract, others under-extract, in the same cup.
The right diameter
The tamper must match the exact diameter of your machine's portafilter -- the most common size on professional equipment is 58mm, though some home machines use other sizes. A tamper that's too small or too large compromises even tamping.
Flat base vs. convex base
A flat base is the standard choice for most portafilters and gives uniform, predictable tamping. A slightly convex base is preferred by some baristas to compensate for coffee distribution toward the edges of the portafilter -- the choice comes down to personal technique.
Materials: wood, stainless steel, aluminum
A wooden handle offers a warm, comfortable grip; stainless steel is durable and easy to sanitize, suited to intense café use; aluminum is a lighter option, common on home tampers.
The basic technique
Correct tamping is straight down (not angled), consistent in force, and finished with a small twist ("polish") to smooth the surface of the puck -- the final step before locking the portafilter into the group head.
What you'll find at Cafetaria
In our espresso tampers range you'll find 58mm options in both wood and stainless steel, plus dedicated storage stands -- choose based on your machine's portafilter diameter.