Heavy Duty Dog Playpen: 12 Steel Panels 47" Height, Square Steel Pipe with Reinforced Crossbars, 27FT 57 Sq.ft Portable Fence for Yard RV Camping, Snowy Black PDF8007Solid Iron Crossbars for Enhanced StabilityThe Kfvigoho dog playpen features a structural design with solid iron crossbars. Unlike typical playpens that use hollow or thinner materials, these solid iron crossbars work together with reinforced steel vertical pipes providing dual reinforcement to create a rigid enclosure. The added weight and density of solid iron provide increased resistance to bending and deformation, making this playpen suited for