The 20mm Silver Screens Filters are small, silver mesh screens that are placed in the bowl of a pipe to prevent tobacco from falling through. They provide an effective barrier while allowing for a smooth draw. These screens are a popular choice among pipe smokers for their durability and ability to be easily cleaned and reused. If you're looking for a reliable way to keep your pipe clean and your smoking experience enjoyable, the 20mm Silver Screens Filters are worth considering.