One blank on BOTH sides quality-looking slate is momentarily inserted into an opaque envelope. It is withdrawn briefly to show it is still blank. The slate is momentarily reinserted back into the envelope and when it is withdrawn it has chalk writing on BOTH sides of the previously blank on both sides slate.

The envelope is completely ordinary and it is empty before and after the slate is inserted and removed. I ordered a leather iPad envelope-bag to use instead of the ordinary, bent, paper envelope that came with the slate because it looks more mystical and classy.

I'm excited to research and experiment other effects with Uday’s Mind Reading Slate.

I was very much fooled by this effect because the envelope is definitely ordinary and empty before and after the slate is inserted into it and removed.

He is selling his product, couldn't he just included everything , you get one blackboard with a wooden gimmick and one white envelope, an instruction link .
Good product but you'll need to purchase separately chalk .