The is made of PVC, and connects the labels in series, so there is no need to stick to the keys like piano stickers. Easy-to-install, Easy-to-remove, without leaving any residue, and keeping your keyboard clean and tidy. Covers the 61 keys of the piano, universally suitable for all kinds of 61-Key pianos, upright pianos, digital pianos and keyboards. Showing the note of each key with double , which helps to find the corresponding key from the keyboard faster, because all piano scores use the and bass structure. You 't need to know the names of the keys or where the Middle C is, you just need to put the note strips on the piano keyboard. Done in seconds When you start to know the keys and become familiar with the octave rule, you can remove the note strips from the keyboard. Key number: 61 Key Material: PVC colour: Black + white Package Contents: 1 x Piano Notes Guide Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.