Note from Martin:

We supply the special cube and a regular duplicate that can be easily switched in at the finish of the routine and examined. A spectator selects a card. Performer displays a small, solid, crystal clear cube and explains it will condense the thought rays of the spectator. The cube is held right under the spectator's nose so they can look closely into it seeing it to be completely empty and clear. Without any switching of the cube, they look again and their chosen card has materialised inside the cube. It's just as simply made to vanish again.

(Note: Prices shown for all shipped items are excluding UK VAT. Overseas orders are shipped without VAT being added, UK orders will have VAT added at checkout where appropriate)