Eison Thumb Piano (KBT017E) Hugh Tracey Treble Kalimba - Thumb Piano 17 Key Treble Kalimba <span class="a-text-bold">Key Stabilizing System</span>: Easy Tunning &amp; Stable Key Sound. With  this key locking system, you  almost dont need to re-tune this  kalimba. It &#039;s faster to  tune the kalimba with the locking  system. Each kalimba is well tuned  before shipment, you can enjoy the soul music right when you receive it. It worths your try! Kalimba keys are made from manganese steel, more easy and comfortable to make sound. Kalimba keys are mounted on an elegant mahogany &amp; maple resonance  box. Mahogany and Maple wooden board makes a better resonating chamber. Unique  key stabilizing system for stale sound by locking each key to  prevent   moving. Safe your time with key tuning and prevent noises during  the   play. Two holes on the back for Wah-wah performance. International Standard C Tune- 1(D6), 2(B5), 3(G5), 4(E5), 5(C5), 6(A4), 7(F4), 8(D4), 9(C4), 10(E4), 11(G4), 12(B4), 13(D5), 14(F5), 15(A5), 16(C6), 17(E6). The Key Labels helps you learn this music instrument faster. The green and white Key Marks helps you find the key and remember key tune.