With the brand extension introduced in mid-2002, the 30 entrants from 2003 to 2006 had 15 wrestlers from both the RAW and SmackDown! brands. At first, the winner of the match received a shot at his brand's champion. Starting in 2004, the Rumble winner had the option of challenging either brand's champion. For instance, Chris Benoit switched brands in 2004 and won the World Heavyweight Championship. The 2007 Royal Rumble marked the first year participants from the ECW brand competed along with the RAW and SmackDown! brands. The winner of the Royal Rumble now has the option to challenge for the ECW World Championship as well.