G-Series The YSS G Series is another premium product at a great price for modern and retro machines, with both mono and twin shock options. Features: .Threaded preload adjustment,rebound adjustment and compression adjustment (Hi/Low speed on most fitments). .Bladder reservoir for better movement and colling. .Calibrated Teflon coated DU bushes. .Sintered piston and heat treated hard chrome low friction shaft. .Piggy back reservoir.