The spring on the pet leash usually plays the role of buffering and retracting. It can relieve the force through the retraction of the spring when the pet suddenly runs or tugs, reducing the impact on the owner's wrist and making the towing process more comfortable and safe. The quality of the spring will affect the using experience and durability of the leash. High-quality springs can stretch smoothly and have good elasticity and durability, and are not easy to deform or damage.
