This is a genuine antique skeleton key (1800's) and perfectly weighted for performing the haunted key effect.  

The Haunted Key is a classic effect that makes an ordinary, antique key come eerily to life, slowly turning over on your open palm. With no threads, magnets, or electronics, spectators are left with a moment of “real” haunted magic that’s perfect for intimate close‑up, dark storytelling pieces, and unforgettable Halloween performances.

Instructions are not provided - but guidance can be given  - or you buy a copy of Key Mysteries * - where you can learn many more uses and methods of performing with a key ! 

*Key Mysteries is a unique study into Keys in magick and mystery entertainment. Hardbound with 286 pages it features essays on the historical and symbolic concepts of keys in magic, plus feature contributions by over 30 highly respected performers on presentation approaches and many routines - both seminal and new. Contributors include David Berglas, Eugene Burger, Bruce Bernstein, Kenton Knepper, Docc Hilford, Marc Salem, Jeff McBride, Roni Shachnaey, Christian Chelman, E.Raymond Carlyle, Professor BC, Robert E. Neale, Bob Fitch, Ed Solomon, Luca Volpe, Dale Hildebrandt, Lary Kuehn, Barrie Richardson, Paul Prater, Simon Drake, Daniele Nigris, Leslie Melville, Paul Voodini, Alan Jones, Jim Magus, Barry Cooper, Ariel Frailich, Master Payne and Mark Fishman Foreword is by Ed Solomon. Author / Editor Steve Drury