In 2005, Hot Wheels continued with new "extreme" castings for the 2nd year, debuting the "Torpedoes" line (skinny bodies and outboard wheels) and "Drop Tops" (flattened rooflines and wheel arches that extend above the car's roofline), in addition to 20 ""Realistix"" models. The rest of the line included the standard 12 "Treasure Hunts", 10 "Track Aces", 50 "Segment Series" "Cars", and 50 "Open Stock Models". Four Volkswagen ""Mystery" "Cars"" were offered as a special mail-in promo. Each "Mystery" "Car" came with a special voucher. Upon collection of all 4 vouchers, one was able to send away for a special 13th "Treasure" "Hunt", a "VW Drag Bus."