The year 1995 brought a major change to the Hot Wheels line, where the cars were split up into series. One was the 1995 Model Series, which included all of that year's new castings. In 1996, the Model Series was renamed to First Editions. 1995 also saw the introduction of the "Treasure Hunt Series" (see below). The rest of the series included four cars with paint schemes that followed a theme. For example, the "Pearl Driver" cars all had pearlescent paint. Sales for the series models soared with another program also introduced that year called the "Bonus" "Car" program, causing stores across the nation to have shortages. Purchasing the four car sets and sending in the packaging backs plus a handling fee gave you the opportunity to collect the bonus cars, 1 each released for each quarter of the year starting in 1996 through at least 2000. Several new wheel designs were also introduced in the 1990s.