• Each spring has a design on the back that ensures durable and even use. • The S-shaped clip features 5 separate supports and screws to secure the frame, ensuring the edge does not break. • Made of carbon steel for greater elasticity and comfort. • Includes 4 springs 50.8 cm long and 16 S clips. • Ideal for seat repair in indoor furniture, automobiles, and other applications. • Easy installation: attach the clip to the wooden frame, place the serpentine, and secure with nails. • Materials: iron, plastic, and carbon steel. • Spring dimensions: 50.8 cm long and 4.8 cm wide.