They ground share with rugby union side Yorkshire Carnegie who were formed in 1991. Both clubs and the ground itself are owned by Leeds. The rugby ground is also on the same site as the cricket ground operated by Yorkshire County Cricket Club. The North Stand of the rugby ground backs onto the cricket ground. The Carnegie Stand was built in 2006 to incorporate executive boxes into Headingley and also expanded the capacity to 21,000 adding extra seating on the top tier and terracing on the bottom. Both Yorkshire CCC and Leeds are looking at redeveloping the North Stand as part of the redevelopment of the cricket ground to rebuild it and to add the seating on both sides to expand the capacity of both grounds and possibly add more executive boxes to the stadium. The club has also looked into the possibility of redeveloping the South Stand and the Western Terrace, however any redevelopment or expansion of the Western Terrace would require the demolition of housing and rerouting of a public right of way. Leeds have had four shirt sponsors since 1981, the current sponsors, Leeds Building Society are currently the longest sponsorship deal the club have had and is the longest in the Super League. Since 2008 the club's kits have been made by Australian company ISC who took over from Patrick. Ronnie the Rhino is the Leeds mascot. He attempts to get the crowd going pre-match, and at half-time he normally gets children involved by playing some sort of game. Ronnie the Rhino visits schools as part of the Leeds RLFC Community project, with the intention of promoting sports and healthy living. Leeds' main local rivals are Bradford Bulls who they played in two Grand Finals and beat in 2004 to win their first Super League title. However the Bulls have slipped down to the lower leagues and competitive games are rare. Leeds also have a cross-city rivalry with Hunslet, who they play annually in the Harry Jepson OBE Memorial Cup, however this is seen as a one way rivalry as they play in different leagues so competitive fixtures are rare. Leeds have West Yorkshire derbies with Wakefield Trinity who they play every Boxing Day in the Festive Challenge. They have bigger derbys with Huddersfield Giants and Castleford Tigers who also challenge for the play-offs. Since the formation of Super League there has been a big rivalry with St. Helens who lost five consecutive Grand Finals between 2007 and 2011, four of which were against Leeds. The two sides have been the most successful during Super League. There is also other cross-Pennine rivalries against Wigan Warriors who they have played in big games and beat them in a final for the first time in 2015 and a rivalry against Warrington Wolves who they have played in Challenge Cup and Grand Finals.