[Easy to Use] AOYNG piano key stickers are made of silicone; attach the tabs without sticking the tape to the keys. Feel free to remove them without leaving unsightly glue marks. [Easy Identification] There is a double pentatonic display of the notes for each key, helping to identify the corresponding keys faster. [Drop and Use] You can easily remove the note strips when you are familiar with the keys and note rules. If you are not so skilled, you can still put it back on. [88 Keys Standard Size] For standard size 88 keys piano, you can easily use it on grand piano, piano, 88 keys digital piano, practice piano. [Note] Not compatible with some non-standard 61/54/49/37 keys keyboard instruments, you need to confirm the size of your keyboard. The width of the gap between the top of the black keys and the keyboard shell must be wider than 0.2 inches (5mm). [For Some Digital Pianos] Since many digital pianos have the black keys and the case attached together, when using this product, there will be a problem of not being able to lay it flat, but this does not affect your use. You don't have to worry about forgetting notes when learning piano, which leads to low interest in learning, this is very suitable for piano beginners.