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The Barista Lab Grounds Bin is a simple designed knockbox that's an excellent accessory for your espresso or coffee set up. It's made out of tough ABS plastic and a rubber bar reinforced with stainless steel.
To minimize noise the rubber bar absorbs the hits from the portafilter and there is also a rubber pad on the bottom to prevent slipping.
The knockbox leaves a small counter top footprint, but can hold 15 double pucks. Just remove the rubber bar and dump the pucks out when it's full. FYI we like to use our spent coffee pucks on our roses. It's easy enough to rinse with some warm water and a little soap.