A spring This spring is used inside a volume switch button, see attached photos. The spring provides the haptic response that indicates the switch’s on/off state. Phosphorus bronze A phosphorus bronze spring is manufactured by drawing the alloy into wire or strip, shaping it into the desired spring form (coiling, stamping, or bending), heat-treating to relieve stress, and then finishing with cleaning or plating before final testing.

G.I.R 1 & 6 Notes to Chapter 74 Text to code 7419, 7419 80, 7419 80 30 , 7419 80 30 00