Rear Shock Extender fits for Yamaha 1983 to present or TTR90 1999 to present The extender will raise the rear seat height approximately 4 inches, This improves handling and makes for a more confident rider! 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. Easy installation with common house hold tools, although a bench vise would help. The package includes a stainless steel shock extender as shown in the picture.