Product Features:Fits 2007-2013 Toyota TundraAluminum Shock Body Dissipates Heat 3 Times Faster Than SteelBlack Anodized 6061-T6 Billet Aluminum ComponentsHard Chrome Plated, Heat Treat Alloy Steel 5/8" ShaftRace-developed, High-flow Piston DesignApplication Specific Valving To Maximize Off Road PerformanceRedundant Sealing Pack System Main Seal, Wiper Seal & Scraper SealSpecially Formulated Oil for Ultimate Performance at Variable TemperaturesInternal Reservoir Design Separates Shock Oil from High Pressure Nitrogen Fox Performance Series Tundra rear shocks feature 2.0 diameter aluminum bodies and an internal floating piston. These Tundra Fox shocks are a cost effective solution to improve the off road performance of your Toyota Tundra. The Fox Performance series rear shocks feature aluminum bodies which dissipate heat better than the traditional steel bodies. In addition to the aluminum body, these Tundra Fox shocks have an Internal Floating Piston (IFP) which is essentially an internal reservoir that separates the shock oil from the high pressure nitrogen gas. Combine the technology of the aluminum body and the IFP with a competitive price and you have a winning combination for your Toyota Tundra.