Chain and Sprocket Kit with Keepitroostin Sticker fits Yamaha Yz250 1999-2013 (13 front sprocket 49 rear sprocket, Black) Fits Yamaha Yz250 2 Stroke 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 Front Sprocket-Jt Racing Steel Tooth Sprocket Rear Renthal Alumnum Sprocket Wps Gold Heavy Duty Chain Tensile strength of 7,480 lbs