Blue violet laser protective glasses perfect for protecting your eyes from pain when using laser instrument, especially for laser engraving machine. Small size, lightweight, convenient to carry. Features: Perfect laser glasses to protect your eyes from pain when using the laser machine. Advanced appearance design, full protection for your eyes and compatible with 200-540nm blue violet laser. Made of high quality materials, safe to use and much durable, very comfortable to wear. Small size, lightweight, easy to carry and store in a glasses case and cloth. Suitable for use in most laser applications, such as laser engraving machines. Features: Material: plastic Color: green + black Item: laser protective glasses br/> Applicable model: wavelength 200-540nm Optical density (OD): OD4 + Transmission of visible light by blue laser: <50% Visible light transmission by red laser:> 60% Glasses case size: 160 * 80 * 60mm / 6.3 * 3.1 * 2.4in Glasses size: 150 * 60 * 55mm / 5.9 * 2.4 * 2.2in Bezel weight: 29g! Package size: 20 * 13 * 6cm / 7.9 * 5.1 * 2.4in Package weight: 172g / 6.1oz Package List: 1 * Protective Glasses 1 * Glasses Case 1 * Glasses Cloth 1 * Eyeglasses Cloth