Compression springs are used to store energy by compression, to provide load (force) or to resist pressure forces. The most used type in the industry is the round wire, the ends of which are closed, and the two sides are parallel to each other. In order to solve the problem of loss of length, to reduce block size and excessive vibration or to obtain non-linear load characteristics, it produces high quality conical, barrel or reverse barrel types of compression springs with the latest technology spring winding machines that constantly renew the compression springs. In compression springs, it is preferred that the spring index, which is the ratio of the average spring diameter to the wire diameter, is between 5 and 11.