I don't have any knowledge of this issue, so I should do some r & d and talk with my metal suppliers as well - thanks for the valid concern! So I'm afraid a hard plastic could scuff the metal, and the silicone could leave potential spots from what you are saying - perhaps there is another solution as well. I plan to use funds from the ruby lab sales to tackle this and hopefully bring a working solution soon - followed by similar cases for my older, larger designs. I can run tests myself once I get samples in, hopefully soon.
Max I would be a little concerned as well. Long term I don't like to keep silver in anything besides hard plastic capsules. I think these plastic cases like I'm using really are best when customized and or have foam padding. When fit right and made with the proper plastic I really think the bars will be well protected.. It's a project that's for sure
Edit- maybe I’m wrong too. Also- I wonder how clear it can really be vs hard plastic, which is obviously perfectly transparent.