Ernie Ball Music Man Spinal Tap Guitar Maple neck; Chrome Yellow body and headstock; Flame paint job on body  Music Man Albert Lee Guitar body style  4 humbucker pickups, sized to match the string width as it travels down the body  Pickup on/off status lights, colored to match to light signals on a drag strip  "Hot-fuel proof" rubber selector switches  Stainless steel exhaust headers, on the side of the body  Functional tachometer built into the body with adjustable redline that measures the attack on the strings while playing  Copper heat exchanger access covers on the back  Key signature Inlays on the fretboard  Tire volume knob, which activates the tachometer lighting when pulled out  Floyd Rose licensed tremolo system, with a gear shifter replacing a tremolo arm. Eight ball on the end of the gear shifter.  12v battery powered  Hand autographed and numbered by Nigel Tufnel of Spinal Tap   This limited edition collectible guitar, signature model of  "Nigel Tufnel," guitarist in the 1984 cult-classic/mock-rock comedy, "This is Spinal Tap," was originally shown at the NAMM show in January, 2001.  The movie "This is Spinal Tap," quickly gained a cult following when it came out in 1984.  Band members toured  in 1992 and actor/guitarist Christopher Guest who plays Tufnel, commissioned Ernie Ball to create a guitar for the tour. With this 2001 version sporting chrome exhaust pipes, four pickups, a tachometer, an iron gear shifter as the tremolo bar, and a rubber boot at the bridge capped by a black eight ball, "the flamboyant working features of this guitar are easily understood by any true Spinal Tap fan," said Sterling Ball, president of Ernie Ball, Inc.  In an article in San Luis Obispo, CA's Tribune Guest said "I wanted something that was going to be instantly flashy and stand out on stage.  But it had to be a working instrument that played well.  There's a big difference between a novelty show guitar and a working instrument.  This guitar looks great and plays great."  He continued, "A lot of people have drooled over it. Jeff Beck has played it and Ry Cooder just totally flipped out when he played it."  When Guest was asked to commission a special edition guital edition guitar for a Spinal Tap auction - Ernie Ball came to mind.  The idea evolved into 25 signed, limited edition Spinal Tap guitars, with the proceeds tagged for the Casey Lee Foundation. All 25 models are the same, with one exception.  The eleventh guitar has a tachometer that tops out at 11 (rather than 8) and the gearshift style tremolo system has an 11 ball at the end instead of the 8 ball.  "The reference to the number 11 also comes from the movie and will be instantly appreciated by fans," explained Ball.  "These guitars are definitely collectibles - there's nothing like this available," continued Ball.  "The proceeds are really going to a great cause."