Eyecup, equivalent to Canon EB, is an eyepiece. This is a compatible product, not genuine, but affordable and easy to use. We have multiple stocks, so we will edit the listing if you comment with the quantity you need. [Compatible Models] Fits the following single-lens reflex cameras, etc. Detailed compatibility and incompatibility are based on Canon EB. 10D 20D 30D 40D 50D 60D 70D 5D Mark2 6D