Grindenstein is a compact, super-strong knockbox that can be used to knock out coffee grounds and as a drip tray for your espresso machine. Specially designed to stand on the espresso machine's drip tray, it fits easily into the top rack of the dishwasher. Grindenstein's patented shock-absorbing design and solid steel core make it extra strong. A thick, durable rubber sleeve protects the handle, absorbs impact, and reduces noise. Both Grindenstein and Big Grindenstein come with an information booklet full of great ideas on how to reuse the collected coffee grounds sustainably instead of throwing them away. Grindenstein holds 6-8 empties. Material is stainless steel, ABS, and TPE. BPA-free. Dishwasher safe.