Serpentain springs are made from two-dimensional S-shaped wires and are also known as "No-Sag springs," "S coils," "Zigzag (zig zag) wire" or "zigzag (zig zag) springs". They are commonly used in ottoman, chairs (seat and back) and sofas (seat and back). Serpentain springs install quickly and easily and don't require a time-consuming hand-tie job. They are fastened with clips and no-sag nails, and they run every few inches apart from front-to-back or top-to-bottom on seats, backs, ottoman, etc. Packing method: Pallet Minimum order quantity: 20' FCL Can be made per your special requirements