[1 piece]

[Set of 4]

[Set of 3]

Product description

Compared to factory springs, it is possible to obtain precise valve hole positioning by reducing the instantaneous and spring vertical shake after the pressure is returned to its full return.
The top and bottom of the springs are also covered with a heavy duty coating to prevent springs from batting each other to prevent noise, and to considerate the shape of the springs to minimize contact with each other.
Uses a common stainless steel (SUS304WPB) as a spring material. There are several procedures to enhance external durability.
Change the spring material to change the characteristic of the player.
Allows you to easily remove pressure points from treble ranges.
Increases sound in medium to bass (enriched)
Effects such as reducing stress on the piston operation.

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Developed for Yamaha Tuba, not for use with other manufacturers