Silver Bullet is a western-themed steel inverted roller coaster designed by Bolliger & Mabillard located at Knott's Berry Farm, an amusement park in Buena Park, California. The $16 million roller coaster was announced on December 1, 2003 and opened on December 7, 2004. A first rider auction was also held where people would bid on seats to be the first riders. The track is approximately 3,125 feet (952 m) long and the lift hill is about 146 feet (45 m) tall. The ride lasts two minutes and thirty seconds and features six inversions including a vertical loop, cobra roll, zero-g roll, and two corkscrews.