Actionline KY-61021 5-in-1 Multi-function Aerobic Step/ Fitness Step 5-IN-1 Multi-Function Aerobic Step, Fitness Step Board dimension: L:21" x W:13" x H:5.5". Color: Gray and Black. Easy to adjust functions as Aerobic Step, Push-Up Board, Stretch board, Foot Stretch, Balance Board Slip resistant top which provides you with a firm. Solid fundation is safe and comfortable in workout Portable and easy to strore.