AeroPress disc made by Able Brewing for use with the Aerobie AeroPress. Essentially does away with paper filters which is ideal if you are using your AeroPress away from home as it takes away the need to carry paper filters around which can be a pain.
Also, being a metal disc, it allows more of the natural oils of the coffee through which can give a fuller taste, not dissimilar from french pressed coffee. This is the Standard version which lets through more fines for a fuller bodied brew. Disc itself is quite thick so should last a long time if looked after.
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