Sixity 2001-2005 Yamaha YFM660R Raptor ATV Clutch Kit w/ High Strength Springs Includes a full set of stack-height controlled friction plates, steel separator plates and high strength springs. Steel separator plates improve heat dissipation and power response. High strength springs firmly clamp plates together to improve clutch longevity and performance. Long-lasting friction discs wear longer and resist burning to smooth shifting and longer running lifetime. Each clutch component is designed to meet or exceed OEM specifications.