Although high-quality steel has the characteristics of high quality and high hardness, it lacks high attenuation. For this, we can combine materials with high attenuation characteristics with steel. After a series of material screening, we finally decided to use high-quality imported 316L stainless steel and graphite crystalline polymer for combination. And through the debugging of the material ratio, this foot nail was finally completed. The sound of this nail is characterized by a very thick sense of density, which greatly improves the line and texture of the medium and high frequencies while maintaining the sense of low-frequency volume, and the two ends are expanded wider and the three frequencies are balanced; There is a very good control under the big dynamics, and the sound stage is open, and the afterglow is rich, as if it injects life into the music and comes alive immediately! This improvement is definitely more significant than changing the signal or power line.