A quick comparison between Shimano 12speed 11-34t Cassettes, 105 vs Ultegra vs Dura Ace. Real weight, and cost/gram when upgrading from 105 to Ultegra to Dura Ace.
105 CS-R7100 Claimed weight is 229g
- https://amzn.to/40FTMcl
Ultegra CS-R8100 Claimed weight is 229g
- https://amzn.to/3x8Xj5n
Dura Ace CS-r9200 Claimed weight is 229g
- https://amzn.to/3YXVKmL

Prices in the video are Amazon US pricing as of Feb 2023.

* Amazon links are affiliated, if you use them a small commission will go to this channel at no extra cost to you, but I encourage you to look around, Shimano products can usually be found on discount around the web.
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These videos are not reviews, nor is it an endorsement of the product in question. Just the checking actual weight of the thing.