[Material upper material]: High-quality PVC material music keyboard stickers can be reused, leaving no glue, will not damage your keyboard. [Size]: The size of the white key and black key sticker is 15. 5*40mm and 8. 5*39mm. [Bright design]: Each note is color-coded and printed with musical letters, up-and-down staff and pitch, which can help you and your children quickly recognize and remember the different melodies of the keyboard piano. [Easy to install]: Just take out the piano keyboard sticker and tap on the electronic keyboard or piano keyboard. [Application]: Piano key stickers are suitable for most pianos and electronic keyboards; a good assistant for learning piano and practicing children or beginners. The package contains 88 stickers, enough for any keyboard or piano with white and black keys (49/61/54/88 keyboard).