Rear Shock Extender Fit for Yamaha PW80 1983 to Present or TTR90 1999 to Present  Made of high quality stainless steel with zinc coating, the product is stronger and more durable, and also rust-proof. It can be used on a bike for many years  Only need to use the ordinary common tools can be installed on, no complex other operations  The rear suspension shock screw can raise the height of the rear seats by approximately 4 inches, greatly improving the vehicle's handling and performance. It is one of the important components to improve the riding experience  This improves handling and makes for a more confident rider