Olympus OM mount lens rear caps, set of 15. (Please note that these are NOT Micro Four Thirds mount caps.) These are compatible products. When a lens is attached to a camera body, the caps must be stored separately. And they are easily forgotten and lost. Genuine caps are expensive, and it's a shock when you lose them. If you use these reasonably priced caps from the start, the shock will be less if you lose one. It's recommended to use these from the beginning, rather than using genuine ones regularly. Also, when you buy used lenses or used camera bodies, caps may not be included. These can be used in such cases. Olympus OM OM Rear lens cap Rear cap