Made of rubber for soft eye contact. You can even view it with your glasses on | Cushions your face while looking through the viewfinder | Attaches to the viewfinder eyepiece minimizing extraneous light and vision fatigue | Compatible with Canon EOS 6D Mark II, EOS 10D, EOS 10S, EOS 20D, EOS 30D, EOS 40D, EOS 50D, EOS D30, EOS D60, EOS 5D, ELAN II, ELAN IIE, Rebel 2000, Rebel G, Rebel G II, Rebel K2, Rebel TI, Rebel X, Rebel XS, Digital Rebel 700, 750 and 850. | The Eyecup provides cushioning around the camera's eyepiece, and is especially useful to eyeglass wearers