Work in comfort. Free-floating platform allows for rocking motion to help reduce fatigue. Surface massage bumps help relieve work-related stress. Three platform height settings (4", 5.25" and 6.5") and up to 25 degree tilt. Elevates feet and legs to improve posture. Width: 17.75"; Height: 4" to 6.5"; Depth: 13.25"; Color(s): Black/Gray.