Features: 1.EASY OPERATION: Used on piano, and you can insert the tuning mute into the key row and pin the keys to get the muting effect. 2.RUBBER MATERIAL: Made of excellent rubber material, with strong toughness and good flexibility, can be bent at will. 3.NON SLIP EFFECT: The rubber tuning mutes have a good non slip effect and are easy to fix on the musical instrument. 4.10PCS IN 1 SET: Including 10pcs piano stopper mutes, easy to operate and replace, and has strong practicability. 5.COMPACT SIZE: The rubber stopper mutes are small and compact, so they will not interfere with the playing. specification:Item Type: Piano Tuning Mute Material: Rubber Product Size: Approx. 10cm / 3.94in PackageList:10 x Piano Tuning Mute