PSP (Power Spring) สปริงคันโยก 3 ชิ้น รุ่นแข็งพิเศษ The tremolo is kept neutral by the balance between string tension and the coil spring attached to its block. As return to a neutral point depends merely on the strength of the coil spring, if the spring is not entirely reliable, the guitar will not accurately come back into tune, especially after pushing the arm down. The power spring has a powerful return capacity, stopping the guitar from going out of tune. Spring Rate :20% up 3 pcs/set
