The 9808OS-AB is the 9800 series oversized throne with Quick Lock base and height adjustable back rest. Lined with a Cordura top and vinyl edges, this throne top serves as a comfortable and supportive base when sitting through long sets. The double braced heavy duty leg base is fitted with Gibraltar's Super Foot for support, and the Quick Lock clamp so that height adjustment is effortless. The GABR back rest is equipped with a height adjust function to fine tune back support.