Etiquette Cutter Replacement Blade, ER9972, Compatible with ER-GN51/GN50-H/GN31/GN30/GN11/GN10 Series Compatibility: Replacement blade compatible with Panasonic etiquette cutters ER-GN51, ER-GN50-H, ER-GN31, ER-GN30, ER-GN11, and GN10 series. Size Specifications: Compact replacement blade with a diameter of 20mm and a height of 28mm, lightweight design with a body weight of approximately 4g. Maintenance Recommendation: To maintain comfortable cutting performance, it is recommended to replace the blade regularly, approximately every 3 years. Replacement Method: To achieve optimal performance, it is important to replace both the outer and inner blades simultaneously. Product Details: Replacement blade parts manufactured in China, ensuring secure attachment and stable cutting performance.