Dice Cup

If you've heard about this impossiblly clean switch, now is the time to try it yourself. Completely self-contained, this gaff does all of the work. An incredibly clean switch of two dice for two different dice.
 
Switch in gaffed dice (supply your own gaffed dice) effortlessly and invisibly.
 
This looks like an everyday cup from your games cupboard, because it is - BUT, it has been ingeniously gaffed to switch out any pair of dice and switch in any other pair right under the noses of anyone watching. 
 
Four regular (ungaffed) dice provided to get started immediately practicing switching (there's really nothing to practice but it's just so much fun to play with this gaffed cup).
 
Just drop in two dice, and tip out two different dice.
 
QUIET - EASY - DECEPTIVE