John Cornelius "Pen through Bill" is the one that I own. It is made of metal and is good quality. I have used it for the last 4 or 5 years with no trouble. NFW is great! A simple Elmsley count and alot of magic. Zoomed......Ben Harris effect? I bought this one. Looks great, fun to do, and broke before I had a chance to perform it! Bill switches? I still do the original Hundred Dollar Bill Switch by Mike Kozlowski. I have heard that Kevin Kings version is much nicer, but I am unfamiliar with it. Hope this helps!