1. No glue, no sticking: The piano note strips are made of silicone and connected in series, so there is no need to stick them on the keys like traditional stickers. Easy to install and remove without leaving residue, keeping your keyboard clean and tidy. 2. Dual stave display: Each key's note is displayed with a double stave, helping you locate the correct key faster, as most piano sheet music uses treble and bass clef structures. 3. Suitable for beginners: No need to know key names or the location of middle C—simply place the note strips on the piano keyboard. Setup takes only seconds. 4. Remove and reuse anytime: Once you become familiar with the keyboard and octave layout, you can remove the note strips. If needed, they can be reinstalled at any time for continued learning support. 5. 88-Key full size: Designed to fit standard 88-key pianos. Compatible with grand pianos, upright pianos, 88-key digital pianos, and keyboards. May not fit non-standard 61/54/49/37-key instruments. Please confirm your keyboard size before purchase, especially the gap width between the top of the black keys and the keyboard case, which must be greater than 2.4 mm (0.1 inch). Package Included: 1 x Piano Note Guide