These filters are reusable filters made from stainless steel, they fit into the AeroPress/Aerobie exactly the same as the paper filters.
Users of the stainless steel filters comment on the improved taste as the oils from the coffee are not absorbed into the paper.
I've been using the same type of filter for a number of years and haven't had any issues with it at all.
Cleaning is simple, just run it under the tap.
Postage is within 1 business day of payment but is usually on the same day. Postage is from within Australia.