The Rocelco Standing Desk Converter Bundle is the perfect way to get your ergonomic workstation started. It comes with a white Sit to Stand Desk Riser and an Anti Fatigue Mat. The Rocelco Standing Desk Converter provides the proven health and energy-boosting benefits of alternating between sitting and standing during your work day, which also reduces back strain and pain. The sturdy steel frame with easy-grip side handles and pneumatic gas piston assist, allows you to easily raise 35lbs on the large 37.5 x 20.5 desk riser top, into infinite heights between 5 and 17 above your existing tabletop. Dual-piston lift system provides smoother more precise height adjustment with a wide range of weight on the desktop, compared to single-piston lift systems. This Sit to Stand Up Desk offers a large 29.3 x 11.6 retractable keyboard tray that slides in, pulls out and locks into place for easier access to entire desktop while also helping you to get into the most comfortable and ergonomic work position. The computer workstation can hold 2 medium size or 1 large monitor as well as a laptop on the desk riser top. The sliding keyboard tray is also large enough to hold a laptop. Your new white desk riser compliments any modern decor and comes with anti scratch foam rubber pads, so it can be placed directly on your current work surface and safely keep it from moving around. The included Anti-Fatigue Mat is designed to work in tandem with standing desk risers.