The S2S Ultrathin System offers the greatest user height adjustability range in a keyboard arms coupled with our Ultrathin Tray for a real sit to stand height range for larger keyboards. This system creates a sit to stand height range that allows fixed height workstations to become sit stand workstations. Ultra-thin phenolic material backed by our lifetime warranty provides years of dependable quality and performance. The removable palm support adjusts easily from side to side to accommodate both right or left mouse use. Includes our Optimizer document holder & cable management for both the mouse and keyboard.