Features: Used for cameras with a diameter of 18MM. Made of hollow rubber, it can be touched softly even with eyes. Eyecup is mainly used to prevent light from entering through the eyepiece during long-term B-bulb exposure to take pictures. Prevent scratches on the EB eyepiece when the camera is not in use; prevent debris from entering the viewfinder when the camera is stored. Provides for protection for camera eyepiece and keep the camera viewfinder away from dust. Plastic body cushioned with soft rubber for comfort and protect your camera. Applicable models: for E 5D 20D 30D 10D D60, 66, 300, D30, 10, 300V, 88, 100, 500, 500N, 700, 750, 850, 1000N , 1000FN. Specifications: Material:Plastic+Rubber Size:Approx.4x2.5x0.8cm/1.57x0.98x0.31inches Color:Black 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: 2x Viewfinder Eyepiece Protective Cover