sleight of hand

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The performance of or skill in performing juggling or magic tricks so quickly and deftly that the manner of execution cannot be observed; legerdemain.
• noun A trick or set of tricks performed in this way.
• noun Deception or trickery.
• noun A deceptive or misleading act.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The required digital dexterity behind magic tricks and illusions.
• noun A performance of such skill.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun manual dexterity in the execution of tricks