No worries mate, thanks for letting me know -will have to have a think on it. Cheers.Hi! I'm afraid I can't say for certain. I've been using the plain stainless versions for over a year now with no visible effects. If the black one is anodized, it is possible that it could eventually scuff the surface a bit. The brass material of the stash is definitely softer than the material of the vap, but the finish could be another matter.