Toca Kalimba Large Thumb Piano. The large Toca Kalimba is constructed of Asian oak with a walnut matte finish. This model has a hollow body that acts as a sound chamber beneath the nine steel keys, producing deeper tones and increased resonance. In addition, special vent holes on the sides of the chamber create a unique wah-wah effect when those holes are covered and uncovered by the player's fingers. (T-THPL)