Features: brand new and high quality. A necessary accessory to protect your eyes from laser exposure. Designed for perfect fit, for ideal for use in most laser applications. Fit for 190-540nm blue-violet lasers (33mm/40mm60mm). Made of high-quality plastic materials, strong and durable. Portable and practical, provides full for protection for your eyes from green laser. Specifications: Material: Plastic Color: Green/Red Dimensions: 33mm/1.30''; 40mm/1.57'', 60mm/2.36'' Type: Green 33mm/Green 40mm/Green 60mm/Red 33mm/Red 40mm/Red 60mm Red Protective Cover: for Protection Wavelength: from 190nm to 540nm. Visible Light Transmittance: >55%. for Protection Features: All-round absorption. Attenuation: (10-6 < N% < 10-4). Optical Density: > 5.0, (OD +5, OD +6). Green Protective Cover: Applicable Model: 200-540nm Wavelength Blue Laser Visible Light Transmission: 60% for Protection Features: All-round absorption for Protection Wavelength: 200-540nm Visible Light Transmittance: 60% Optical Density: OD 4+ for T(405nm-450nm)=15% Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Laser Safety Protective Cover