Problema Dice
This is available in very limited numbers
 
WOODEN VERSIONS SOLD OUT NOW - ONLY THE PLASTIC VERSION AVAILABLE NOW
 
See new video here https://vimeo.com/martinduffy/problemanew
 
Magician shows a box containing six dice numbered from 1 to 6.  The lid is replaced and the box is put to one side.  The spectator is given a die and told he can have three rolls of the die to get the highest possible score.  A 6 is inevitably rolled and when the lid is removed all the dice in the box now show a 6.  
The dice can now be removed by the spectator if desired as they are normal dice which can now be used for any other trick.  
The box and lid can be examined too. 
 
IMPORTANT
The 'forcing' die was poorly made so I had a better version made - this can be used separately with the supplied magnet for many other effects - see video here.  This is supplied as a free upgrade with any of the box versions and can also be ordered on its own.
However the cheaper version of the dice did have its advantages (it was weighted and so often would roll a 6 without any external magnet needed) so I will include that with any order.
 
Plastic box is 6cm x 4cm x 1.7cm.