Tone springs were developed by focusing on the effect that tremolo springs, which support string tension, have on the sound. Springs are also an important factor in building the overtone structure of string vibrations, and especially in floating tremolos, which have few points of contact for transmitting string vibrations to the body, increasing the number of springs and strengthening their foundation will make the sound image thicker. However, simply increasing the number of springs can cause problems such as making floating impossible or the springs coming off when pulled up because they are fully compressed. ESP Custom Lab has developed soft and flexible springs to solve these problems. Set of 15 Thank you for viewing.