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 to transmit string vibrations to the body, the sound image becomes thicker by increasing the number of springs and strengthening its foundation. 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. ・Designed to be used with 4-5 springs on an average guitar setup. Adjust as desired. ・Can be used in combination with other springs. Also effective for floating setups and sound quality adjustments. ・Effective for non-floating tremolo settings as well. Brand new, unused. The package has some damage. Thank you.