Features: Size: Suitable for all 88/61/54 key pianos and keyboards. Never Fade: The letters are printed on the backside of the transparent sticker, so they can withstand constant impact of fingers, not easy to fade. No Residues Left: The adhesive on the backside is full of durability, can be removed / pasted many times. Great Feeling: 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, kids feel joyful to learn the piano and memorize note positions.