To maintain comfortable cutting performance, we recommend replacing the blades approximately every 3 years. Suitable for FEIGOU oval nose hair devices. This product is a set of outer and inner blades. Safe design that does not hurt the skin. When replacing the blades, replace both the outer and inner blades at the same time by reducing the diameter of the holes on the top. Nose hair trimmer replacement blades (Not applicable to ER-GN series) Sent in simple packaging. The actual product photos are on the second image. 55-64500