A must possess item for mind-readers. A slate is shown to be blank on both sides and kept in an empty envelope. A card is chosen by the spectator from a full deck. When the slate is removed from the envelope, the chosen card is written on it!

Or use it for what they were originally intended, to reveal "spirit writing." You can get two of these and use them as Spirit Slates, without the need for the envelope.

A good item for all type of shows.