WP uses separation pistons in reservoirs for all OEM and Aftermarket shocks. The separation piston has many advantages, such as a long live cycle, good sealing of nitrogen and oil and great adjustability. This however demands some compromise due to the moving piston, which creates some heat and therefore can create some fading after intense riding. A bladder system eliminates the moving parts and therefore keeps the oil temperature more consistent. Also, the character of the shock changes when using a bladder instead of a separation piston. The missing initial break-free of the piston makes the overall ride feel more smooth and less harsh. This bladder kit has been designed to fit the WP OEM Link shocks MY 2016 and newer (e.g. KTM SX and XC models, Husqvarna, TC, FC, TE and FE models with a standard shock).