I know that the black V-Slot linear rails are anodized, but could someone confirm that the silver V-Slot linear rails are anodized, too? (I suspect they are, but the wording in the description is somewhat ambiguous to me: "OpenBuilds V-Slot is made with 6063 T-5 Aluminum Extrusion and has a beautiful, shiny, super smooth, clear or black anodized finish.") Thanks!