piano hammer heads The piano is a stringed instrument. When the pianist plays a key on the keyboard, the mechanism, using a system of levers and balances, moves a hammer so that it hits the string. The hammer is made from wood covered in felt. Its’ shape changes depending on the type of piano (upright, grand, fortepiano ) The weight and the shape of the hammer, and the density and the elasticity of the felt, define the sound characteristics and emphasize the expressive ability of the piano. During the life of the piano, and for many different reasons, the felt changes and causes a reduction in the variety of tones as well as making the sound more aggressive.
piano why re-felting
piano how refelting