QualityMade of high quality metal, high strength and hardness, sturdy and elastic for the right amount of tension, durable to use. ApplicationApply to different occasions with 20 kinds of different specifications and sizes. ConvenientStored in a transparent plastic box, each size of springs has an independent slot for easy storage and use. Contents Includes extension springs and compression springs in 20 different sizes, 200 pieces in total. Size Storage box size: approx. 22 x 11 x 3 cm. Features: A box of springs of different sizes, in total two hundred, to meet your needs. There will be no shortage of use. 20 kinds of springs with different specifications and sizes, can meet different needs. An essential hardware for various repairs and maintenance , such as: bicycles, locks, automotive, plastics, electronics, hardware, switches, lights, molds, toys, etc. Note: Please use the spring within the appropriate tension force range. Material: Spring Steel Note: Due to manual measurement, there may be an error of 0.5-1cm. The color displayed in the picture may not be completely the same with the actual item due to the shooting method and the display device Package content:20 sizes springs 200pcs