[Elastic Material] Metal spring assortment set is made of spring steels, it is sturdy, durable and springy in the right amount of tension, and durable for long time use. [Neat Typography] The inside box of assorted springs has 12 separate little split boxes to keep the metal springs in order and you can pick out the accurate size you need quickly in different situations, there is also included a handy guide with visuals on the box for your reference. [Smooth Edge] This torsion spring is made of excellent workmanship, the surface of the spring is carefully treated, and the inner spring is firm and not easy to break. The edges are smooth and wont hurt your hands. [Application] With the help of our spring assorted kit, you can fix or repair a various range of hardware, like toys, electronics, corroded battery compartments and woodwork tasks. At the same time, they are also very suitable for making handicraft models. [Packing] The compression springs set with compression springs and extension springs have a various 200 springs of 12 different sizes are packed in a transparent box. : Made of high quality spring steel. Set in practical assortment box with resealable clip fasteners High quality and durable springs. Apply to different occasions with different lengths, sizes and turns A total of 200 tension and compression springs in one assortment box. Specifications: Color: Silver Type: Spring Set Sub-Type: Compressed Springs Size Of Storage Box: 24x11x2.6cm Weight: About 0.39 Kg Material: Carbon Steel Surface Galvanized Feature: Apply To Different Occasions Quantity:200pcs Product contains: 200 x tension springs