Size: Suitable for all 88/61/54 pianos and keyboards. Never Fade: The letters are printed on the backside of the transparent sticker, so they can withstand constant of fingers, not easy to fade. Without Residues Left: The adhesive on the backside is of durability, resuable, leaving without residues on piano keys, without harm to keyboard completely . Great Feeling: The sticker is smooth and without resistance, making it comfortable when practicing techniques such as portamento and arpeggios. Simple to Read: The piano letters are large enough, clear, and simple to read, feel joyful to learn the piano and memorize note positions.