Micro fine flavor enhancing perforations release coffee’s full flavor, while filtering out impurities for a richer tasting cup of coffee. Double crimped filter design for extra strength and durability is guaranteed not to burst. Chlorine and Gluten free. Micro fine flavor enhancing perforations release coffee’s full flavor, while filtering out impurities for a richer tasting cup of coffee Double crimped filter design for extra strength and durability is guaranteed not to burst Chlorine and Gluten free Kosher certified Natural brown 40 filters per pack Melitta® number 1 filters can be used to fit all coffeemakers that have a number 1 cone.