At a cost of £212.00 I managed to obtain Magiro's Spirit Dice. You place dice into a small container with a lid, fixed on a small, thin tray. Another dice is then rolled. Spectator removes lid to reveal both dice numbers match. Brilliant concept, works like a dream. Container on tray and the lid can be freely shown - giving no clue as to any 'method', or explanation. For anyone fortunate enough to own one of these gems, I'd suggest obtaining 15mm rubber dice . This is a true classic.