This is the new espresso machine basket developed by VST. It is something of a revolution in basket manufacturing.
Each basket has been designed and created in such a way that it guarantees a size, distribution and shape of holes perfectly suited to extract chosen amount of coffee.
In essence this means that you can now grind finely enough to properly extract your dose of coffee, while still maintaining a desirable flow rate and brew time of approximately 25-30 seconds.
There is more information here.
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