the set of slate will do the job, but the fiting flap mechanism is far from perfect it's too small
about 0.5cm on one side and 0.8cm on the over so it's very visible.
You can use it on stage and
flash the gimmicked side but it will not resist to close examination.
I wouldn't let anyone examine my invisible deck, thumb tip, ESP board, side walk shuffle, sawing a girl in half, expanded shell, Svengali deck, folding mirror, sword through neck OR my magnetic slates.
I have a question for you 'Anonymous from france', why the hell would you let someone touch your work tools?
This comment is clearly from someone who ISN'T a working magician. A good magician can walk up there with two whiteboards that are only held together with a balled-up chunk of chewing gum, and they can still get the entire crowd on their side and believe whatever the hell they say. REAL MAGIC is about the performance. I bet this person would still complain if they hired actual ghosts to read their mind and write whatever they want on the slates. Just because the handwriting "isn't legible enough, or ghosts cost too much
"