Zig Zag Spring Are Made From Two-Dimensional S-Shaped Wires And Are Also Known As "No-Sag Springs, "Sinuous Springs, "S Coils, " "Zigzag (Zig Zag) Wire" Or "Zigzag (Zig Zag) Springs". They Are Commonly Used In Ottomans, Chairs (Seat And Back) And Sofas (Seat And Back) And Take Thmore...