Hi all,
I'm afraid there's nothing fancy to them (obvious statement!
). Just discs of untreated beech cut from a fallen branch, no bark removal, no nothing!
I did find that the thin ones seemed to warp / crack after a week or two indoors, so only the thick ones survived. They're a bit wobbly and wonky of course, but that just makes me laugh. Mrs Womble says she wishes I could cut fresh bread that straight - perhaps I should use my chainsaw!