Spring
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Many keyswitch designs make use of metal springs. Often these are steel, but some cheaper switches use copper-coloured, non-magnetic materials (in Hua-Jie switches, it is phosphor bronze).
Spring types
- Helical (coil) spring, used for return springs
- Leaf spring, used for click leaves amongst other things
- Rubber dome: most keyboards now use rubber domes for the return springs instead of steel helical springs