【High Quality Material】Our compression spring is made of high quality material, stable and durable, smooth and smooth, smooth riveted, high ductility, good fatigue resistance for long time use.【Smooth Edge】Our trampoline spring has excellent workmanship, the surface is carefully treated and does not scratch, the inner spring is strong and not easy to break. The edge of the tension springs is smooth and will not hurt your hands.【Important tools for the family】The extended and compressed range of springs is easy to use and store and essential for the family. You will love these extension springs.【What you get】8 sizes of extension springs and 12 sizes of coil spring that you can choose according to your needs. It is enough for your daily use.【Widely Used】The steel spring is used in automobile engines, main electrical equipment, medical equipment, electronic products and other measuring equipment.