Manufacturer: Produced by Eiken Industries Co., Ltd. in Shizuoka-ken, Japan.
Quality: They are known as the number 1 filter brand in Japan and are considered "original-quality" aftermarket filters.
Construction: They feature durable oven-baked paper, more pleats for a larger filtration surface area, and NBR rubber gaskets that resist extreme temperatures.
Performance: Capable of holding dust particles as small as 5 microns.