Specification: Material: Silicone Color: Classic Black / Rainbow Color Package list: 1 x Piano Keyboard Note Strip Feature: --The Piano Keyboard Note Strip is made of silicone, 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. --Showing the note of each key with double staff, which helps to find the corresponding key from the keyboard faster, because all piano scores use the treble and bass staff structure. -When you start to know the keys and become familiar with the octave rule, you can remove the note strips from the keyboard. Of course, if you feel that you are not skilled enough, you can put it back at any time. --Fits standard sized 88-key pianos. Perfect for grand pianos, upright pianos, 88-key digital pianos and keyboards Note: Some non-standard size 61/54/49/37-key keyboard instruments may not fit properly. Please confirm the size of your keyboard before purchasing, especially the width of the gap between the top of the black keys and the keyboard shell, which must be wider than 2.4mm (0.1 inches).