These lens caps were found at an estate sale. I don't know too much about them but I'm happy to try to answer any questions.
4 of these are branded "Canon" and are made of plastic. They were made in Japan and seem to be the same size (E-58).
The last one is made of metal and has 2 parts that slide back and forth.
---- At ESG HQ, we always try to use as much recycled packaging and packing materials as possible ---- Thanks for looking!