Click image to zoom
DOBANI Thumb Piano Keys 5-Pack
Thumb Piano Replacement Keys, 5 pcs. There are 5 metal keys; all approximately 3.3 inches (83.82 mm) long, 4/16 wide (5 mm), and 0.029 of an inch thick (1.5mm).
Once installed, the keys can be adjusted by tapping them in or out to adjust their length, and therefore their pitch.