The flow of Dyna-Flo cardboard is made to change ... changing shapes, sizes and configurations of cardboard boxes, boxes and bags. Dyna-Flo's durable design of staggered polypropylene wheels allows for even coverage of the wheels no matter what size or shape your inventory takes. It is the perfect choice for product mixes with multiple and / or variable SKUs. Available in 12 "to 16" sections, it is designed to fall quickly and easily into the existing pallet rack to create a productive flow system.