For bass players who play for long periods of time, the weight of the instrument is a major concern, and for that reason many players choose a lighter bass.
However, lighter basses tend to lack the desired attack and sense of pitch in the low range, and the low range tends to be less tight.
On the other hand, it is also true that a light base gives off a warm, woody feel and an enveloping, spacious feeling.

So we came up with the idea of putting a backbone into the body to control the body's rigidity and resilience against string vibration. By installing the Red House BBA (Back Bone Assist), it is possible to achieve a balance between these two.

In addition, since BBA is basically intended to be applied to light materials, the change caused by installing this system will not cause the weight to feel extremely heavy, and will not affect the feel of the material.