Walnut is a fine domestic wood that delivers a warm spunky low tone.
My first pair of wooden bones were walnut. Walnut is relatively light in weight and density, yet heavy enough to provide the kinetic force you needed to make them click with ease. The wood is pleasing to the touch and the mellow sound is perfect under many situations. An excellent choice for both new and experienced players.
Walnut wood is warm and inviting. The color varies from light grayish brown to deep chocolate brown to an almost black purplish brown. The grain is slightly open and usually straight, but can also be wavy or irregular. The texture is somewhat coarse but uniform. The surface is generally dull, but it may develop a lustrous patina after years of use.
Walnut is a favorite among fine woodworkers not only because the wood looks great and is easy to work, but for the pleasingly distinctive aroma of the fresh cut wood.
Figures below are approximate (but pretty darn close)