Each spring features a back bend design at both ends, ensuring it stays securely in place. The springs are precisely machine-cut for accurate and consistent sizing, with clean cuts that prevent fraying and resist rust. This sofa spring repair kit is designed to attach zigzag-shaped, non-recessed springs to wooden frames of upholstered furniture for use in seat or back support. Made from carbon steel and subjected to standardized heat treatment, the springs offer reliable elasticity and durability. The design includes a 48mm high arch and 25mm short spacing, providing enhanced support and load distribution. This kit helps restore sagging cushions by reinforcing the sofa's internal support structure. Repairing with this kit offers a cost-effective solution to restore furniture functionality without replacement. These springs are the same type used in commercial and custom furniture manufacturing.