A. Material: The coffee filter is made of 304 stainless steel with a double reinforced 0.2mm thick filter. This can shorten the extraction time and achieve an optimal extraction rate. The coffee filter has a mesh size of 600, larger than ordinary filters, which ensures that no coffee grounds enter the cup and affect the coffee's taste. B. Reusable: The portable coffee filter holder retains the oils in the coffee and preserves its rich taste. Disposable paper filters are made of wood pulp. When bought in large quantities, they may deteriorate and be costly. Reusable stainless steel filters are economical and a good choice. C. Portable and Durable: Reusable coffee filters are suitable for business trips, traveling, camping, etc. They can be used separately and are easy to transport. You can use them anytime, anywhere to get a great cup of coffee. D. Easy to clean: This reusable coffee filter is a two - layer stainless steel mesh filter: one layer is a 600 mesh filter + a fine mesh filter, which helps you get great - tasting coffee. The package includes a black cleaning brush to facilitate cleaning after use. It is also dishwasher safe. E. For coffee lovers: Simply heat the permanent coffee filter in hot water and rinse it well, add coffee grounds, slowly pour hot water and let the coffee flow through the filter. When done, remove the filter and enjoy your coffee. The coffee tastes smooth and delicious. The filter can make 1 to 4 cups of coffee, so you can have afternoon tea with your family.