AQUATECH Eyepieces are required to help secure the AQUATECH Sport Shield Rain Cover to your camera. Made from a lightweight and strong plastic, the foam end has a similar feel to the camera's stock eyepiece. These Eyepieces are also a great replacement for the standard issued eyepieces if they become lost. The NEP-6 Eyepiece also features a unique cutout so as to not impede the viewfinder sensor on the Nikon Z6 and Nikon Z7 cameras.