The FM300 and FM300B, with their ball bearing rollers, encourage gentle rocking of the feet in the same way a rocking chair encourages movement. This rocking motion uses most of the lower leg muscles to increase healthful circulation. The FM300B offers built-in massage balls to rejuvenate tired feet. In addition, both offer 3” height adjustment for custom positioning. Features •Ball-bearing rollers encourage rocking motion •3” height adjustment •Non-skid, inset pads •Rubber feet protect flooring •Massage balls (FM300B) Specifications •Solid hardwood platform •Steel frame •Phenolic side supports •Rubber pads •Plastic knobs •Dimensions: 16” W x 11.875” D •Height range: 3.75” to 6.75” •Metal Finish: Brushed Aluminum