The ER-i Eyecup is the standard eyecup for the Canon EOS R1 Mirrorless Camera. It is made from silicone rubber, provides even cushioning around the camera's eyepiece, and is well-suited to eyeglass wearers.
5/5 – Perfect fit for my EOS R1. The silicone rubber is soft, gives even cushioning around the eyepiece, and is very comfortable to use with glasses.