Nitro Gas Shock bore 40mm with 20mm shaft Profender twin tube shocks are designed with a big piston and a big shaft that provide excellent performance suited for heavy duty use. The perfect specification allows the driver to enjoy a more comfortable and improved ride. Low Pressure Nitrogen Gas prevents a cavity of oil inside the shock when it gets hot. These shocks will consistently work until you arrive at your destination. The inside of the piston is made of Teflon, which allows it to slide smoothly and last longer. The shock absorber is made of materials from Sandvik Company, Sweden. They are accurately controlling the needed damping force. It is sealed properly to protect oil leaks and can perform very well even in dust and dirty conditions. Included in this kit: Profender Front Strut Profender Rear Tough Dog Front Coil Tough Dog Rear Coil Tough Dog Transmission Spacer *Exclusive comfort kit