- Plastic Rolling Desk Chairs by Giancarlo Piretti for Strive. These plastic chairs are easy to move around with the wheels on the bottom and can serve as desk chairs, waiting rooms, or even as additional seats for guests. They are stackable and their plastic seat and back are easy to clean and resistant to the elements. Made with a plastic chair seat and powder-coated steel legs, each was designed by Giancarlo Piretti for Strive. A practical addition to your home or office. They measure 20.5 inches wide, 22 inches deep, and 33 inches high. The seat itself is 18 inches wide, 16.5 inches deep, and 18 inches high