Espro 58 or 53 mm Automatic TamperThis tamper was designed to take one more variable out of making great espresso, consistent tamp pressure. The Espro Automatic Tamper is a piston action tamper that lets you know when you exert 30 lbs. of pressure. The handle depresses a bit and makes a subtle clicking sound when 30 lbs. of pressure has been applied. The base is a convex bottom and made of stainless steel, the handle is anodized metal.