Brush pressure is automatically maintained at one of five settings, on traction units, while the LCD provides diagnostics and hour meters, covering transport, scrubbing and key-on. The Disk machines offer nearly 35% more power than other machines. The deck is protected by steel guards and large polyurethane rollers keep the unit from marking walls. Brushes are driven by powerful motors, and are gimbal-mounted, to improve cleaning on uneven floors. The Cylindrical machines have the added benefit of sweeping up debris while scrubbing. This may eliminate the need to presweep an area, increasing productivity.