The Proteus non-cuttable bar uses ceramic spheres in a cellular aluminum structure to dull cutting tools.
https://diqn32j8nouaz.cloudfront.net...ttable_bar.jpg
https://diqn32j8nouaz.cloudfront.net...table_bar1.jpg
More:
https://newatlas.com/materials/prote...ke-lock-armor/
Originally posted by FEM2008. Reposted with larger images.
