Great for restaurants and bars from Bob Solari. Show a knife and have it examined. Borrow a bill that the spectator signs. Fold the bill in half and plunge the knife right through center the bill! They HEAR the bill rip ! Next the knife is SEEN and Heard tearing the bill ! The bill is immediately opened showing it to be unharmed. Easy to do, Nothing is attached to the blade, Complete with knife, gaff, and illustrated instructions .