Application: It is suitable for beginners of electronic piano, hand rolled piano and electric piano, and is a good partner for learning electronic piano.Learn electronic piano and piano faster, recognize piano keys, become familiar with and memorize piano scores to speed up learning rhythm; Suitable for all pianos and keyboards: color big white keys and black keys big keys stickers 88/61/54/49 keys; Easy to Clean: No harm to the piano, black and white collocation is integrated with the piano. The sticker is transparent and thin, easy to paste, if torn off, it will not leave glue marks; Easy to install: with detailed instructions for use; Perfect Gifts: It is a good gift for children or friends who are learning piano. Size Chart: 1.5cmx3.5cm/0.59inchx1.38inch Package Includes: 1Piano Keyboard Stickers Note: Please allow slightly errors due to manual measurement and different monitors.