Panasonic Replacement Blade Men’s Shaver ES9610. Just like razor blades, the blades wear down with use. The outer blade should be replaced approximately every year, and the inner blade approximately every two years. We recommend replacing the blades regularly to enjoy a comfortable shaving experience. ES-L690U-K, ES-L670U-K, ES-L650U-K, ES-L650D-K. All my products are 100% Authentic. […]