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<p>[QUOTE=&quot;springfld.arsenal, post: 237176, member: 54&quot;]Thanks for info; good ideas on the physics-based testing, I can look up hardness of some common stuff and see if the spheres scratch it, I&#039;m as always looking for the quickest easy answer.&nbsp; I could peruse porcelain-bead vendors and see if any even offer them in 4mm, I didn&#039;t notice any last trip there but wasn&#039;t focused on that.&nbsp; For all I know the 4mm&#039;s could have been the beads-de-jour when these were first sold perhaps decades ago.[/QUOTE]</p><p><br /></p>

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