24 mm buttons
Although they are mostly used for secondary buttons, the 24mm buttons can be used for classic panels 
(just like the 30mm buttons), they are suitable for people with slightly smaller hands and thus bring the buttons closer together.

They are also perfect to integrate them on a Hitbox (Controller without Joystick) where the 30mm buttons will be used in most cases only for the jump key, favoring those of 24mm for the action keys.

24 mm buttons

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