damper block

English Thesaurus

1. damper consisting of a small felted block that drops onto a piano string to stop its vibration (noun.artifact)

hypernym	:	damper, muffler,
definition	:	a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations (noun.artifact)

part meronym	:	piano action,
definition	:	action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressed (noun.artifact)