The eyecup is made of soft and durable silicone, so it allows for more comfortable viewing through the cameras viewfinder. Meanwhile, it can prevent scratching and damage to eyeglasses. Whats more, the dome-shaped eyecup effectively shields light that may enter the viewfinder and cause flare. It also can be mounted to the viewfinder easily and securely.
It replaces original Nikon DK-25 eyepiece, compatible with Nikon camera as below:
Nikon D5600, D5500, D5400, D5300, D5200, D5100, D5000, D3500, D3400, D3300, D3200, D3100, D3000