[Material Upper Material]: High-quality PVC material music keyboard stickers are reusable, no glue left, and will not damage your keyboard. [Size]: The sizes of the white key and black key stickers are 15.5*40mm and 8.5*39mm respectively. Bright Design: Each note is color-coded, printed with musical letters, upper and lower staves, and pitch, which can help you and your children quickly identify and remember different melodies of keyboard piano. [Easy to install]: Just take out the piano keyboard sticker and tap on 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 to fit any keyboard or piano with black and white keys (49/61/54/88 keyboard).