A bunch of different sizes to checkout and buy:
amazon.com/s/?_encoding=UTF8&camp=1789&creative=390957&field-keywords=rubber%20lens%20hood&linkCode=ur2&rh=i%3Aaps%2Ck%3Arubber%20lens%20hood&tag=viewnow-20&url=search-alias%3Daps

The consensus:
These little hoods are a great little addition to your camera bag if you don't need a full matte box for your shoot. They have 3 stages: Flat for storage/Open a bit/Open a lot.

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