Features: Shock absorbing 19mm eye cup reduces eye fatigue during extended shoot, featuring soft silicone cushioning and secure 19mm snap on installation. Crafted from ABS and heat resistant silicone, this camera viewfinder cover block external light. Ideal for professional photographers and DSLR users seek enhancing comfort and upgraded compatibility with FM3A/FM2/F3 series cameras. Perfect for studio, outdoor event, or travel photography where prolonged viewfinder usage demands ergonomic eye protective. Universal replacement eyepiece combines flexibility and robustness, offering seamlessly compatibility while protecting delicate viewfinder component. Specifications: Name: Viewfinder Eye Mask Component:Silicone Easy to install Suitable for D700 D800 D3X D2X D2H viewfinder eye mask Package Includes: 1pcs Camera Eye Cup note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.