[ Material]: Our tension springs are made of galvanized steel, sturdy and elastic which provides extra durability in the right amount of tension, not easy to rust.[Various Sizes]: We offer 12 sizes of extension springs and 8 sizes of compression springs to meet your different needs. All kinds of springs allow you to always find the right one.[Obvious kinds]: These springs are clearly classified in a storage box so you can quickly find the springs you want during and after use. Additionally, the lid of the box has included a handy guide with visuals. No more wasting your time. [Widely Used]: The steel wire tension spring replacement kit includes compression and extension springs, suitable for tools and equipment, hand tools, automotive, furniture, spare parts, etc. [Ideal product]: a hardware essential for various repairs and maintenance, we are absolutely sure that you will not regret your choice.