This Bar Merchandiser uses a very simple mount to attach to hollow tubular uprights. Saddle Display Hooks outfit the Bar.  Given how hidden the fixtures are by the Crocs Flip Flops I see no reason why the bar and hooks could not have been powdercoated and environmentally friendly like the grey uprights.

For other Flip Flop fixtures in merchandising SEE…
Customers Design Own Flip Flops
Prada Summer Dare-to-Wear
Flip Flops in a Fish Bowl
Flip Flops Flat Boxed
Flip Flopping Wicker Baskets
Cubist Bell Jar Sells Sandals
Flip Flops Climb a Ladder
End-of-Season Endless Basket for Flip Flops
Mass Merchandising Flip Flops
J-Hooking Sandals
Flip Flop Specific Multi-Hook
Sidewalk Bulk Bins for Flip Flops”*