From Dura Trac Farrow
The Clearspan Farrow floor is completely self supported; no additional support is necessary. It features a two level construction. The 1 inch center rise reduces crushing and allows the newborns easier access to underside nipples. The 24 inch wide center sow area is wide enough for the sow, but not so wide to lose advantage of the raised center. The wear areas are kept small and replaceable for minimal maintenance cost.