Kensington Conform Wrist Rest, SmartFit, Ergonomic Design (K55787US) Ambidextrous design allows right hand or left hand use Conform padding provides support while nonstick pads on base allows wrist rest to move with mouse for more comfortable use and continuous alignment Ergonomic wrist rest relieves pressure and keeps arm at neutral angle Rest is compatible with all mice, including both wired and wireless Smart Fit comfort color size chart and 4 color coded interchangeable inserts are included to ensure a proper fit