28" Fitness Exercise Aerobic Step Board Home Health Trainer Workout W/ Riser Specification: Shape：Trapezoid Material: PP & ABS Platform Size: 28 x 14.17 x 4" (L x W x H) Adjustable height：4" - 6" - 8" Thickness of riser：2" Weight: 10 LBs Weight Capacity: 440 LBs Package Include：1 x Stepper; 4 x Risers