Applicable to full-face helmets K3 K4: This lens is an accessory designed for full-face helmets K3 and K4, which can perfectly match the shape and size of the helmet to ensure a stable installation. Mirror plating: The lens adopts electroplating technology, the face is smooth and uniform, with anti-scratch, anti-reflective and other functions, providing a clear field of view and a comfortable use experience. Day and night universal: This lens has a day and night function, which can effectively resist the glare of the sun during the day and provide a good perspective effect at night to ensure riding safety. Easy replacement: The replacement of the lens is very convenient and can be replaced at any time according to actual needs. No professional tools are required, and the operation is simple and quick. Enhanced safety: The lens has high clarity and wear resistance, can provide good vision and protection, and help improve safety and comfort when riding. It is a practical motorcycle helmet accessory