It's the Original Club Step™, but only it's black & gray!
Made of stable polyethylene for durability and long life. Adjustable from 4" - 6" - 8". Has a nonslip, shock-absorbing ribbed platform mat for safety, and non-skid rubber floor pads for traction and stability. 14" x 40" stepping surface supports upto 300lbs. Includes 4 risers.