The first step to great handling and predictability is selecting proper spring rates. With over 500 Hi-Performance Springs to choose from, Race Tech is almost guaranteed to have the spring you need. Sportbikes are generally under-sprung for the average rider, causing the bike to be unbalanced and unpredictable.Features: High quality These springs are made from chrome silicon wire High stiffness to mass ratio Shot-peened and heat treated for durability These are the finest springs available! Accurate Rates No Sacking-Out Fitment Honda CRF250R 2010 Honda CRF250R 2011 Honda CRF250R 2012 Honda CRF250R 2013 Honda CRF250R 2014 Honda CRF450R 2009 Honda CRF450R 2010 Honda CRF450R 2011 Honda CRF450R 2012 Yamaha WR450F 2006 Yamaha WR450F 2007 Yamaha WR450F 2008 Yamaha WR450F 2009 Yamaha WR450F 2010 Yamaha WR450F 2011