Solid steel rack construction with reinforced steel base; 4 heavy-duty 360deg swivel wheels with 4 breaks; Easily moves across multiple surfaces; 2-stack - holds up to 30 pads, depending on size; 4-stack - holds up to 60-80 pads, depending on size. DESIGN & DETAILS: 4 heavy-duty 360deg swivel wheels with 4 breaks Easily moves across multiple surfaces ADDITIONAL SPECS: 2-stack - holds up to 30 pads, depending on size 4-stack - holds up to 60-80 pads, depending on size