HINSON RACING SPRING KIT CLUTCH YZF450 CS216-6-0315Developed with and recommended to enhance performance of OEM pressure plates as well as Hinson clutch baskets, inner hubs and pressure plates, Made out of high temperature steel to outlast anything else on the market, Highly resistant to losing strength due to high heat from 4 strokes, The correct stiffness to handle high horsepower engines, Provides optimum hook up with minimum heat build up, Made in the U. S. A.